Engine milling maths

The vintage non replaceable intake I get as I was a little leary of having it milled. LD340. Graham has been doing this for more than 30 years, so I went with what he knows from years of doing this. I only got to know him this year. This is the first work he has done for me. Never heard of him b4. Then a few ppl say: hey I know that guy, he does good work. He balanced the rotating assambly also. He is very good to talk to. Only thing we kinda disagreed on was: he wanted to zero deck the pistons and use the .039 gasket. Most on here said leave the piston the .015 above deck and use the .053 gasket. Which he reluctantly agreed. I actually was thinking that first, but u guys on here seemed to think either way would work. So we left it as us and still milled the heads .031. Compression is 10.2-1 with the thick gasket. I can’t thank u guys enough for all the help with my buddies build. Even after he changed ideas a few times. Kim