80’s 318 compression ratio figuring out where I’m at.

I’ve got 596 heads on it (that’s the way the motor came). I cc’d two difference chambers and got 63cc both times. So these may have already been milled in the past (not sure how much). So if I’m starting with 63cc chambers another 0.030 shaved will put me at around 57 cc’d and at 9.3:1 which should work out on 91 pump gas. If my intake doesn’t line up I can always mill the intake side of the head no? The car came with the adjustable 273 rockers and what looks to be beefy pushrods Didn’t measure but way thicker than stock pushrods). Cylinder heads also have upgraded springs as they have dampers in them (not sure what springs). A couple members thought the cam may be a 220 @ 0.050 cam with about 470 lift. I’m still trying to confirm the specs with Crower but I think it’s a super old grind and nothing they’ve sold in decades.