Recommend Head Rebuilding

1973_Scamp said
This is just a street build, weekend cruiser. I also have stock "302". The though is to have 308 rebuild with 2.02" intake, 1.60" exhaust with mild bowl port for future bottom end upgrade or 360 block.
I could rebuild "302" as well, then save "308" for future swap. Most head rebuild cost ~$500 per pair. I'm trying to go "green"

I'd put the 302's on the stock 318 bottom end. They should improve your compression ratio a bit, and the small ports will keep the velocity up. The rest of the build is pretty mild, so I wouldn't even bother with larger valves in the 302's unless your valve seats already need work. Keep them plain and save the upgrade money for the 308's later.

RustyRatRod said
Nuthin special at all about the 308. They are the same as anu other open chamber, 1.88 intake valve small block MoPar head.

Not true. There isn't much different, but the exhaust port has a better design and flows better than the older J heads. Intake side is pretty much identical. But there is a reason why folks were swapping J heads for 308's before all of the aftermarket heads came out.

That said, given the aftermarket heads out there now though I wouldn't mess with porting or doing too much work to a stock set of heads. By the time you've gotten decent numbers out of them, you could have bought a set of EQ's, RHS's, or even Edelbrock's depending on how big you went. I had the 308's ported for my 340 before the RHS's came out, and I needed an open chamber because the early 340 and KB's I already had put the piston's .018" out of the cylinders. But by the time I had them flowing 264 cfm I could have bought a set of RHS's and had the chambers clearanced or 340 Edelbrock's and had even more flow.