Welcome to the Stovebolt

I'd get it running and stopping so I could drive it around before I make any decisions on swapping the drive line. You might enjoy the slower pace of driving an antique truck!
The truck was built to run on roads that had max speed limits of 50 mph. Trying to make it run faster will involve new brakes, suspension, steering, engine and transmission upgrades. There have been a lot of nice old trucks torn apart only to end up as unfinished projects because the owner didn't factor in the high cost in time and money to finish the job. Installing the cab on a modern chassis can be done, but you'll find the cab is very narrow and won't just drop on any frame without modifications.
Mike B

Mike,
I completely understand your point. I am no stranger to Hot Rodding and indeed you can go DEEP into a rabbit hole. Right now, I am of the mindset to get the truck somewhat roadworthy. The truck needs tires. I don't really want to spend a lot on tires if eventually I want to do a front/rear axle upgrade.
I tend to do much research and like to talk to people who have been there and done that so I can get a feel for what was involved, what they would do differently and what the correct "recipe" is.
I have seen much theoretical talk about front and rear axle upgrades but not run into anyone that has done it and has pictures. So I tread there with some caution until I do some more research.
Marty