milling 440source heads

If i want to up my Compression whats wrong with milling 440Source One heads to 68cc's(head and intake)

I checked with 440source and you can take them to 64cc's if you want. They have enough material to go .100inch no problem
My EDY heads are 84cc's so the 440Source One heads at 68 would be a nice CR bump-right??

I run a mechanical cam and adj rockers so valve adjustment would be no big deal-right?