Well.......you CAN do it that way, BUT the early transmissions also have a different input spline count, SO what you have to have made is a custom converter with a late large converter hub front half and an early correct spline count rear half. But the adapter ring works fine and is a much cheaper alternative. I don't think I would run it anymore until you find out for sure if that was taken care of. Because the late engine WILL FIT the early transmission as if everything is fine if they didn't know about the crankshaft register difference.