Have some questions.
According to a Mopar small block race engine 'manual' I have the HiPo 360's had the 340 cam (not 6-pack) in them and J-heads. I just used the magnum heads instead since they are still kind of plentyful and supposedly flow better; and I added the Prof Products air gap intake. MPP suggests a 750 carb for their crate engines, which made me curious if I should go with the bigger carb. I wanted to stay as close to 9.5:1 CR so I can run lower octane if I wanted (it's actually is 9.6), the the origional pistons were so far in the bore I needed a flashlight to see them. But the 360 +.030 over (.010 shy of the 340 and bigger stroke) should have more grunt than the 340.