checking compression ratio

BTW, OP, is this on the engine stand? Seems like you could get a decent ballpark number if you:
- find true TDC on the compression stroke
- flip the engine so the spark plug hole is 'up' and so that the spark plug hole's axis is at a certain angle to vertical. You have to make sure there are no air pockets for accuracy. You'd have to look at a head off the engine to see what angle on the spark plug hole (relative to vertical) would put the hole right at the top of the chamber. (I have one buried somewhere...)
- and carefully fill 'til the fluid is a few threads up in the spark plug hole. (How far up is another important parameter.)

Your measured volume plus the computed displacement for bore & stroke can be used for computing SCR.
SCR = [Fill volume + cylinder displacement]/[Fill volume]

FWIW, OP, I get 9.2 to 9.7 for the parts you describe; the variation depends on the head gasket thickness (.028" or .039" or .051"). Sounds right for stock pistons with a later head gasket.