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If it were me I would go with the closed chamber and thicker head gasket, just in case you end up rebuilding your motor or put those heads on another short block you can zero deck your pistons. Let us know how it runs after the change, I have the same type of pistons in my 340 as you do and...

Hey no problem, should of been a GTS though, no 340’s came in a dart GT.

I have a 68 GTS that is missing its original 340.

With the engine running the oil pump gear tries to move up and will close that gap.

Maybe not your matching #'s but might be for someone else, hint hint Nice car by the way.

How is the balance on the kits? I have seen guys with other kits buy the cast to save a few bucks and end up spending more than a forged kit getting it in balance. If the Scat kit is balanced right it shouldn't be a problem though.

Can't wait to see how it runs for ya. I have been looking at buying a set of heads and the trick flows look like the way to go. I was going to put them on my 340 for now until I get a short block stroker put together.

You need a piston stop, run it up close to tdc going clockwise and then go back counter clockwise and use the middle of the 2 marks. Now you have tdc.

If you had a bore scope and could get it turned to see the intake valve next to the exhaust valve you may be able to tell

Can I ask where you ended up buying the EQ's from?

It has been a while since I had any machine work done, but in my area I bet you would have right around $1k in those heads to do a total rebuild with good parts, ready to bolt on and go, not including cost of the heads themselves, and that is if they are still good and able to be rebuilt.

If it were me I would look at buying some EQ heads bare and have them set up the way you want them or look at IMM engines website. They have them ready to go with 202 valves. They are a better flowing head than any stock passenger car head also. IMMENGINES.COM

I do not have a part number but the 69 and earlier A/C water pump pulley is smaller. I just bought one last year from a member here.

Looks good! I just picked up 98 Durango for the 360 in it. Going to do something similar, might swap it into my dart while I go through the 340.

Not personally, IMM engines did a build with them without a rebalance. Build A 500HP Capable 360 Magnum Short-Block On The Cheap! - Hot Rod Network

How about these? more $ but forged. https://www.summitracing.com/parts/uem-ic741-std?seid=srese2&cm_mmc=pla-msn-_-shopping-_-srese2-_-icon-performance-pistons&utm_source=bing&utm_medium=cpc&utm_campaign=Brands+|+I&utm_term=4581871113127145&utm_cont

I agree, and initial advance is going to be what the combo will take, might have to fill and file the slots on the advance to get the dizzy advance lower. My 340 has 20 initial, any more than that and it kicks back the starter when the engine is up to temp.

A rebuilt dizzy and an FBO limiting plate are a good option if you can't find the MP dizzy, they were a copy of the accell dizzy I think.

Is there a VIN number on the block? On the transmission rail behind the driver side head if it has one.

I have used the Mr Gasket Chevy crank key for an offset cam key in a 340. When I degreed the cam, IIRC the 2 degree Chevy crank key gave me 4 degrees advance.

Does your head look like this on the intake side? Looks like 48 degree stuff is cut for push rods to go through. The casting number I think is the same for 48 and 59 degree stuff, just part number is different.

I agree, can't beat the air gap or performer rpm. Is the 340 built in 68 for a 69 model?

You are correct, A/C cars got the smaller pulley and 6 vane pump.

Here is one, no balance job needed. ttps://www.hotrod.com/articles/build-500hp-capable-360-magnum-short-block-cheap/

^lick the link at the end of A.J.'s post

what kind of aftermarket heads do they use now days? I have seen some with edelbrocks but that was a few years ago.

LOL^^ A see through set would be nice to get a quick look without pulling a valve cover.

No need for clear valve covers to make sure your lifters rotate, you can turn the engine over by hand before initial start up to confirm they rotate. If you wait until start up it is probably already too late.

At the very least you should lap new valves in and look at the valve and seat to see if the angles are the same after lapping. And also check the guide clearance.

Very nice, glad it is working out, you answered some questions i had just by your pics. Was wondering what heads and rockers come on it.