I think he means that you need a long tailshaft tranny
and the F-body has a short one.
the long tailshaft is needed because of the shifter
location.
I bought a '70 Barracuda that had a 833 from a A-body
and I drove it around that for awhile. The guy who did
it just cut a hole for the shifter in front of the stock hole
When I took it apart I noticed the metal from the hole
was still there but bent down on one side so all I did
bend it back up and weld up the slots
Like they say on E-bay (easy fix)