Modern Drivetrain Swap into '65 Valiant

That does seem to be a good way to go except that they’re about as common as hens teeth.

they are not impossible to find. I traded some 340 torsion bars for the one I have (pictured). I have an 87 D100 that originally came with a slant/904 that I will most likely use the adapter with a built slant and A500 in the truck