360 heads on a LA 318 vs Magnum heads on a LA 318

Slantsix64 said
360 heads on a stock 318 equals really low compression probably in the 7:2:1 range, pretty much loss of low end but you gain high end.

but keep in mind the roller La 318 had taller pistons and actually were 0.040 in the hole. In the ones i took a part, those 360 heads are like 72CC mill them down .040 probably get you in the 68cc area Advance that camshaft 4 degrees or more to build up some pressure run a thin *** head gasket you might be alright, then again depends on your camshaft and rear gears also.

I'm sure that this has been brought up before, isn't there a formula to follow when you mill the heads? Also would milling the heads and the deck surface along with thinner head gaskets affect port alignment, intake manifold bolt holes lining up, also push rod length? I know that I asked several questions here it's that I've never seen this item's brought up when guy's say to have the cylinder heads milled. Thanks everyone, I'm trying to learn, don't mean to be a pest.