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The D0VE heads are a direct bolt on and will get static c/r close to 9 to 1 in an OEM 75 short block.
Best to go with roller rockers, studs and guide plates. The OEM rail rockers chew up valve stem tips even with an OEM cam.

The PI heads will bolt on but the intake valve is 2.19" and the diameter of the intake relief on oem pistons is not large enough radially if cam timing gets too aggressive.
In addition the PI heads have an 88 cc chamber which still leaves static c/r in the 8's.





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