Keith Black Enterprises, 562-869-1518, makes and sells a billet steel adapter for use on the top fuel crank with no built in register that presses into them that has the proper I.D., O.D and depth for using and locating the later model torque converter hubs in them. I wouldn't try to use the later model stick shift flywheels on them Buy the early type flywheel that centers on the outer crankshaft flanges properly