Probably illegal too.
Answer: Become a "builder"
Get a flood damaged modern pickup or compact pickup. Strip and sell all the body parts.
Do a complete wiring ripout and remove the ABS as well. Buy a simple hotrod harness.
Now you'd have a modern chassis, suspension, brakes and powertrain without all the crap
Install your favorite vintage car or truck body and register it as such. (56 Chevy pickup...1940 Ford Sedan delivery etc)
There are plenty of utoob videos of people doing such builds.
My dad has a 1990 GMC Suburban. It’s a tank on the road, especially given that all my previous cars have been Hondas or Nissans, but given today’s regulatory environment I keep offering to buy it from him but no luck so far. LOL It still runs well and is a great workhorse auto.
I need to do some version of this. I totalled my '96 F150 4X4 in November so I need a replacement.
Finding one is no easy task on an island in Southeast Alaska.
I've thought of finding someone in the lower forty eight to build one for me and ship it up here. Might even be cost-effective? It doesn't have to be pretty.