I have a Doug Nash 2 add on OD unit for a C6 but it is going in my 71 Ranchero 429 GT.
I think I have decided to go with a standard transmission just to get rid of a high stall TQ and with the power range of the cam I don't think an auto would be better for the occasional street use.
I have a newly rebuild C6 with the TCI master racing kit and new TQ in it. Never used or hooked up yet I was thinking of putting in the 63.
Guess I will start looking for a tranny and bell etc in a few month's when I can get started on the 63.
Greg