2001 Bonneville 1.0.0

I've got a 1970 T-37 Tempest, which i recently learned through PHS is nowhere near original, so ive decided to swap the motor from a 350 2v to a 455, the 455 i purchased came with a TH400 attached, but is from a 1970 bonneville. The T-37 as of now has a TH350, So I guess my question would be what would need to be changed, if anything, to put the bonneville TH400 into the Tempest or would the TH350 handle the stock 455?
 
Thanks, Sam

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Hi from Mississippi and have a 1970 bonneville convertable. Still working on it, as I'm sure most continually do. Thanks for the add and a good Pontiac group. 

Hey fella's! New to the page. but i've been thinking of doing an Auto to Manual swap in my 69 Laurentian. i know these cars came with either a 3-speed or 4-speed, could anyone help to identify these transmissions? and possibly track down a clutch pedal/linkage assembly.

1998 Pontiac Trans Sport Owner's Manual