Help me please tryin to beef up 318

You can mill the heads .040 total (2 cuts) then mill the intake face of the head .038 (another 2 cuts). that should get you down to 65 cc chambers. Go conservative on the cam, stock 340 or 268 duration, around .470 lift and matching springs. Get rid of the Performer intake and get a stock 340 intake or large port (340 or 360) aftermarket intake manifold. You will need to adjust the throttle cable so it completely opens the carb. Adjust or get a new auto trans kickdown to work with the 4 barrel carb. Timing is everything, start at 10 BTDC and work your way up from there till it runs best or pings, then back it off. Do a search here on how to time your car.