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Here's what is commonly done. Lose the fuel injection. Aftermarket heads, cam, intake and carb. Headers. Distributor. It is not exactly cheap. It gets you into the 400+ hp range.

From LXGuy's thread: http://www.forabodiesonly.com/mopar/showthread.php?t=106857

I likely should not be getting into it on dustoff's thread. I've put up a couple threads already and got decent feedback from people including LXguy. I've done a fair bit of reading on the subject as well but found there's a lot of differing opinion - and hot tempers to go with the opinions...

It's all so easy until you get to the cam. The cam... The stinky cam choice... Hurts my brain #-o

So can anyone give a rough breakdown for horsepower gains? Stock 5.9 upgrade heads only. Add cam upgrade. Add intake/carb. Add headers/exhaust. The comp cams simulator does this but not sure how accurate that is and I'm not sure how to input a stock cam.

I'm not the expert but it seems to me the power gain from just a head swap is going to be far less than what the heads make possible with the right cam and other parts.

This thread shows how a good bunch of FABO guys are willing to jump in and try to help. The advice varies but that's OK because its all well intentioned. I feel for you, must be very frustrating but I'm sure you'll get it solved with help here. You will know a lot more than when you started...

Just out of curiosity, with 10.5 : 1 compression, what kind of fuel will you run? The reason I ask is I'm planning a 340 rebuild and would like to do the same, but plan to lower it so I can run pump gas, unless I put out the bucks for aluminum heads, in which case, I'm told 10.5 might be OK. Arlie