What to mill 360 heads.

PO of our car had put 360 heads on the 318 and didn't mill them. Sooooo when we changed cams we had the heads re-worked our machinist did the math and recommended .040 and the thin Cometic gasket to get about 9.0 to1. Our guy said to check the intake before we had it milled because we may not need to. We didn't. And also that because of the forgiving nature of hydraulic valve trains not to mess with shims either. At .040 we would be fine. So that's what we did. And it seems to run strong.