I have custom made pistons from diamond. They are 3.905 bore pistons and for a 4.000 stroke crank. I decided to build a 383 but change my mind and I am going to build a 347. I was wanting to know if there is any way that I can still use these piston in my motor or have to sell them. I asked a friend and he said that I would have to get custom rods for the motor. Does anybody know what I can to do.