74 heads on a rp code block?

any idea what the comp. ratio would be? anyone done this yet? how did it run? final comp. ratio?

 

I'm assuming you are using a 69 block here? You'll need to plug the 2 extra water holes on the heads, or you'll have water in the oil. You will also have to change to oil through the pushrod style of lifters and pushrods.
The compression should be the same, I believe all the 350 heads had the same combustion chamber size. Jim Burek