Does the shifter on your present transmission have a reverse lockout lever? It's possible it got an upgrade to a SM-420 when the later model 235 got installed. The old crash box is a very small, pretty flimsy transmission that's a nightmare to shift- - - -especially downshifts. Lots of double clutching involved! If you've got a 420 already, all you'll need is a V8 engine bellhousing and some fabrication to mate the 292 up to it.
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!