8)thanks for the help guys. the 440 source heads look nice. the only negative thing i have read about them is you have to check them for headgasket overhanging the combustion chamber.thanks mopar658)
not a problem--order the gaskets with them that they sell.
I believe they are the standard .039 thickness . I installed all that stuff on a friends 440 a while back--everything was great quality.
those 516 are closed chamber --you will get a bit more CR. They will flow about the same as the 452--not really a huge difference--not enough to worry about. Both are ancient and prone to cracks , and heavy ...
You will be better off getting the modern heads---get the 440source stuff.