[fastfox420n/a]

The block measures perfectly, this is not a question that will be answered with a torque plate. It is a matter of surface finish, not out of round

Yes re-hone the block. You're getting new pistons, so hone to 100 percent clean up and then order them. That block is o ringed also, if it was honed with a torque plate it would not measure perfect as your stating. Surface finish is gonna depend on ring type, and usage.