Differential and axles, possibly also the subframe.
I agree with knuckles... sounds like hell... I know getting a 350 into a friend's TR7 in high school was horrible, but god it was awesome once it was running (Never did see it really "finished" before he left for the Navy and the car ended up in storage for 20 years.... but we went for a few test drives which were great!) But yeah, length is the first obstacle that comes to my mind.
PLEASE keep us posted if you do tackle this!!!
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