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Mumbles you made a great point with the ring gap, as you suspected I DID check end gap towards top of cylinder and should check at the bottom. The motor was seized due to moisture I believe and rings were beyond stuck. I destroyed a piston and rod unseizing the motor.i was fortunate and found NOS pistons, rings, rods, wrist pins and a new crank also (very reasonable price) the old pistons weren’t scored and neither is the block so I thought would be a good rebuild candidate. Without the crank installed (just pistons with rings in cylinder) the pistons feel “right” thru the entire stroke, no drag. I agree I should try installing just the crank and torque the lower block and check resistance and narrow it down to crank clearance issue and if not the issue then attach the rods to crank and check again. Process of elimination thanks for the reply’s sometimes just need a nudge in the right direction.
It's a jungle out there.