302 heads and cracking

Okay, I read back through the post and edited. I think you’re right on target with that cam and 3.73 and 9.6:1. There are some faster rate cams that “may” give a more power, but I really like that cam for all the parts you stated you are using. With the 340 exhaust manifolds, I might would look for a split pattern cam but there are worse cams you could use.