I have a 49 Chevy 3600.It is pretty much original with the exception that the engine was changed in 53.There is no damage other than a couple of windows,and no rust.All I need to do is bleed the brakes,and it would be driveable.
I think I will just clean and paint,and leave it all stock.It is in amazing condition to have been in MO it's whole life.
The only changes I have made are wheels and tires,only because it didn't have any,but that's not a permanent situation,so no problems.
I might change my mind midstream and big block it with a car frame,but that isn't the plan right now