One thing to consider in the restore vs restify argurment is that you're going to do if you road trip that classic and something original style fails. I'd love to find a Hudson or Nash, but if the engine was missing to too far gone, I'd probably swap a Jeep 4.0l and AW4 auto into it instead of hunting down another factory I-6 and using the stock trans.......Why, parts! If something went wrong on the road, 4.0l parts should be easy to come by because they made a ton of them, used them for 20 years in 6 different Jeeps, tend to run forever, and made decent power. Another plus would be that they were Inline 6's and the last AMC engine still in use, so it still "keeps it in the family" and something not so cookie cutter vs even any Chrysler engines let alone a GM or Ford engine. Same could be said for the suzpension and brakes, would be a lot easier to use Camaro, S-Truck, or Jeep parts (where applicable) over stock for the same reason, better chance of finding the needed stuff in a random town than the old stuff.