There should be plenty of those transmissions available at a lot less cost than trying to rebuild one that's in in poor shape. The old crash boxes are usually considered scrap iron on anything that can be adapted to the later synchronized transmission, even if a bellhousing swap and some modification is involved.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!