you have reached a tricky question. 318's are hard deal to boost compression on. you will probably not be happy with the comp on the 360 head even after taking .060 off . first off i have heads on stock that are ported 318 heads w/ hardened seats milled .060 that yield 11-1 comp because the chamber in a 318 head is significanly smaller than the 360 .the 3.91 to 4.00 bore 318/360 compounds this.but to answer your question. we take material off the intake side of the head as opposed to taking material off the intake itself, therefore allowing intake changes without custom intakes. either way you take that much off youll have to remove the linup pegs on the block so the intake will fit. any time you start milling over .030 things get real fun real quick 318's and 360's have a different compression height in the piston. there fore making the 318 piston at tdc sit further down the bore (compression problem) only in 1971 did chrysler put a true flat top piston in the 360 after that they dish them to drop compression (emissions) small cc eddy heads are another good solution to your problem. or buy a domed 318 piston. and while your down there you might as well put a 4.00 crank and make a 390? see it never ever ends it just depends on the $$$
