Rearend & Transmission upgrade for 63 Riviera

[63'Riviera]

hey, so i am currently in the process of rebuilding my 1963 Riviera with a 401 and dynaflow but my plans for the engine were dual quad and twin turbo and i know the dynaflow shouldnt have that extra power going through it so i wanted to do a tranny swap any ideas?? Im looking to get around 400HP or more from the twin turbo system. Also im not sure about the rear i think its a 3.23 or something like that but ive seen other people using 9inch rears but any experts out there what do you think? thanks for your help

 

[monzaz]

Rear ends

Already MAking custom rears for most GMs We can do a 8.5 10 bolt center or a LARGE 3/4 tom 14 bolt center for that car. WE will need to dig up some brackets off another rear and have your rear to take measurements from. Jim

Things ain't cheap BUT can be done. WE have a 10 bolt 8.5 BUILD for the 67 Riv right now. Jim

 

[KQQLCAT]

Your rear end will handle what you have it's actually bigger than a 9". just find a posi in the gear ratio you want.