In Need Of Some 8 3/4 Technical Info

You can buy a cut down for a body housing for $250-300 from bob mazolini in riverside.
There are different b body lengths.fyi one of them will fit in nice with the right offset wheel.

A body 8 3/4 are narrower than a body 7 1/4. fwiw something to ponder when considering the narrower b body rear in an a body.