I really like what you're doing with the truck! Lots of hard work I can tell, I applaud you for keeping it up. Looks like you have most of the "hard" (it's all hard isn't it?
) work done.
I've got a 64 short fleet, but my dad has a 46 Chevy Pickup that is mostly original. It has a later model straight 6 (235) in it, and it might have a slightly newer trans as well. Right now, it's a driver, good for putting to the store and stuff. Anyway, we've been throwing the idea around of putting an IFS in it, and making it a bit more drive-able. We definitely don't have the skills, tools, or time to go as big with the project as you...but I thought you might be able to recommend something aftermarket that isn't a major PIA?
Good luck completing your project, it's gonna be SICK when it's all done, not many of those trick 46's around!