IIRC, If you really need a cast 318 intake, the ports on both of those are going to be big for a 318 head. Some of the 318 guys would know better than I .
I agree on a low compression mill. The biggest issues with the 318 are of course small displacement and then low compression.
If your slugs are .”70 in the hole, the. A big 72 cc head chamber will give you a 7.5-1 ratio.... or less.
Getting the piston to a zero deck height with the likes of a KB piston will get you about 8.5-1 and a 65 cc head will only get you about 9-1/9.2-1
Reducing the head chamber to 59cc’s will get you about 9.9-1.
At this point, milling the OE iron that much is more than likely not possible. Use the Edelbrock Magnum head at 58cc’s.
For a mild bump in street performance, the cast OE stuff is OK. Without a piston change, your nit really going to far.
