just cc,d my heads will this be too much comp. ?

Hi I have a set of 1970 U heads for my 69 340 I will be putting in my 72 duster. Just did a cc check and I cam up with 65 CC heads have a stamp on them of 63.4 cc I would assume this was not done at the factory but by a machine shop. I have sealed power L2316 pistons bored 40 over. My question is will I have too much comp. for pump gas with these heads? I know the pistons are factory 10.5 to 1 and that is with 72 cc factory x heads I assume. any knowledge on this will help as I don't want to have a race fuel only engine.