Well the GMC 2 1/2 ton 6X6 army trucks (CCKW?) had 302's with dual range Hydramatics. Maybe you should look for a military truck as a trans donor. If you find one you take the trans and I'll get the motor.....
Have you looked on the oldgmctrucks.com site. Good GMC info there and they have a friendly discussion board. Good Luck.
