You have chosen what is the most difficult transmission to swap effectively of all the ones that will bolt up to the V8 engine. The geometry of the throttle cable linkage that controls shift points and pressures leaves absolutely no room for error. Getting the engine/trans assembly to bolt together isn't difficult at all. Getting the trans to shift properly and not destroy itself is extremely difficult. A turbo 400 or even a 350 would be a much better choice. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!