There was an excellent article on tranny swapping into A-Bodies. It was featured in Hot Rod Mag or Perterson's Musclecar and if memory serves, it was in a 1995 issue... I do believe that you had to move the cross member by an inch or two and possibly make a change to the driveshaft. I hope it helps, I'll go and check and see if I still have the article around.
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When I did mine I did not have to change the tail shaft.
I measured my T-350 from front flat surface where it mates to the engine to the end of the tail shaft flat surface where the splined shaft exits.
In my case the T-350 was 2.5 inches shorter than my 700R4 - so I had to shorten the drive shaft 2.5 inches because the 700R4 was 2.5 inches longer. Make sure the drive shaft is re-balanced after it is shortened. Measure your T-350 relative to your 700R4 because there are about three different lengths of tail shafts on the T-350 transmission.
I used the T-350 transmission steel/rubber mount to bolt it to the frame cross member after I slid the cross member back in the frame. Last I re-drilled the frame to re-attach the cross member to the frame.
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