273 commando rebuild question

If the pistons/rods are lighter the machinist will drill the crank to balance the weight. The 273 rods are plenty strong and I would use those. The machinist will weigh all the pistons and use the lightest one and make them all weigh the same by removing material inside the piston. They do the same with the rods. They make them all weigh what the lightest one is. tmm