3769973 318 Heads on my new motor

According to my reference book "How to Hot Rod Small Block Mopars" the heads are 75-76 assembly years with 63 to 69 cc chambers. 1.88/1.6 valves are a nice up grade, cut the chambers to 63 cc's, a thin gasket and you'll be 9+ compression ratio. Headers would be better than the 340 manifolds; sell them to some one doing a resto, pay for the headers. I'd go for more carb, I've done 3310's and 750 DP's on teen's (though it was/is strictly a track car) and not had issues. The Performer works good on a teen; others may disagree. Cam with .480 lift is going to be around 230-235* at .050 with a 4spd it shouldn't pose too much of a problem, could be a fun driver.

Good luck.