Does anyone know anything at all about the T-50 5 speed manual that was offered in place of th 200/350? To me it sounds like it was only offered in 76-77, although they were also used in Monzas.

The Borg Warner T-56 seems to be the beefiest out of them all, with it being used in these:

Aston Martin DB7 Vantage
Aston Martin V12 Vanquish, 2001-2006
Chevrolet Corvette, 1997-2007
Dodge SRT10 Ram, 2004-2006
Dodge Viper, 1992-2007
Ford Mustang Cobra, 2003-2004
Ford Mustang Cobra R, 2000
General Motors GM F platform V8 cars, 1993-2002
Holden Commodore 1998-2006
Holden Monaro, 2001-2006
GM M12
2004–2005 Chevrolet Corvette Z06
2004–2006 Pontiac GTO
2004–2006 Cadillac CTS-V
GM MM6
2004–2007 Chevrolet Corvette
GM M10
2005–2006 Chevrolet SSR
2006 Holden Commodore

What all would I need to do to mount it up? Would I need a different bellhousing? I have a '77 with the TH-350 and 350R.