Edelbrock Rpm heads on 360

Those pistons look like some aftermarket lower compression 340 pistons.... could be standard bore, low compression 340 pistons with the 360 block bored out .040". But they ought to come right to the top of the bore at TDC. Those eyebrows look to be the 10 cc variety.

Can you very accurately measure from the deck down/up to the flat top of the pistons at the absolute highest point in the stoke and let us know? And are there any markings on the piston domes? Once that measurement is known, then the CR can be computed.

Not a ton of lift on the valves so not much to worry over there.

Cam is small...good for low/mid RPM torque. But that's another good reason to take the measurement requested to figure out the CR, and then make sure you are not moving too high for DCR with that small cam, and straying too close to detonation problems.