Most 360 heads range in the 70-72cc ....318 heads like 675 open chamber heads are 68cc, later open chamber 318 heads are 72 cc, like the 163/593 castings.
What was the concern again?
Without a doubt, anything bigger than 68cc will lower the compression on the early pre 74 318s. The remedy is to mill .026-.045 off.
Point was in some cases it's no difference!
72cc 2.02 #915 j head or 72 cc 1.78 #163/593 heads...
