I once visited a junk yard to buy a Saginaw manual box for a hot rod build. They wanted $75 for a used one off a Chevelle. I looked a little further into the yard and found an AMC box from a Hornet(?).

Same box save for the coupler on the end of the steering column.

For the AMC they wanted $15.

Same box. I think it was the series 525.

FORD 300 inline six - THE BEST KEPT SECRET IN DRAG RACING!