New Process NP435 truck gearbox, 2WD close ratio

WANT New Process NP-435 truck 4 speed, 2wd, close ratio. I'm looking for a box with the 4.x:1 1st gear. I have one now out of a 72--74?? or so 6.x low gear

Hopeing to find one not clear across US, Im in the N end of Idaho

I think I can adapt a Chevy/ Ford/ other one and in fact this might be an advantage. (Have to drill the 5.9 Magnum crank for clearance, won't THAT be fun