valve to piston clearance
You list the compression of the piston. How about a part number. Sounds like a flat top piston with that compression ratio. You need to know the chamber size of your heads to determine the CR. To check the clearance the motor would have to be assembled. You would use modeling clay on top of a piston, bolt the head to the block. You could set up the valve train on the one cylinder to check the clearance. Also you could discuss this with your machinist.