What is the difference between flywheel on a 410, 428, 428cj and a 428scj. Does the 428 SCJ take a different flywheel than the 410, 428 and the 428cj. I hear that the scj428 has a different Ford part number, C9ZE A, than the others. I know you have to add the hatchet behind the harmonic balancer on the scj428 unlike the others but I thought the flywheels were the same