Penguin wroteIt can be done.
The body length was at the fenders.
The tubs a very near in size, I put a 75 tub on a 64 frame.
Body mounts will be different.
75 and down the tub is the same, in 72 they lengthen the fenders and hood to fit in the i6 in. this last till 75. in 76, a new model came out with different tubs, frame, pretty much everything was different.