Pontiac guy gone Mopar.

The 5.7 has a ring pressed into the crank register for the car NAG transmission. Weld something to it and slide hammer it out. With that ring out, it is the size you need for the convertor hub on the Torqueflite. Done it a hundred times. Do searches in the Hemi Swap section. Lots of great information. Welcome aboard, great looking rides, and good luck on the Hemi Swap!!