Budget 318 build

Ok so after doing some calculations if my math is right milling my 318 heads .040 will take my cr from 8.39:1 to 9.1:1 that's using a .028 gasket thays assuming my calculations are correct here is how i done the math it was stated before that .005 removed is 1cc so .004 would be .8cc .8x10 is 8cc. I haven't cc my heads yet but im guessing they are around 63cc so that would put me at 55cc so i put all the info in summits cr calculator and came up with 9.1:1 I did my deck height at .1 cause I'm not 100% sure what it is after I pull the heads I can get some more accurate measurements. It may be .075 which would be even better!