55 series 1 build

[fredico]

Son #3, Anthony, wants to rebuild our 1955 series 1 chevy 3600 3/4t by installing a small block 350, T400, disc brakes, fuel cell, and so on.... The truck is stock. I took the bed off some years ago and put inside. It's the only thing that does not have surface rust. The metal is not too bad with the exception of the back top of the cab. It got crushed by a locust tree. Now for the questions. What would be the best way to pull out the rear top of the cab? It was creased at the corner. Should it be cut away and replaced with new metal? Obsolete chevy has metal for earlier (1953 back) cabs. OK, now the fun stuff. What differential will fit that has 3.73 gears and disc brakes? The stock rear has 4.10 gears. What front end can be installed to add power steering, and disc brakes w/o cutting and replacing the entire clip? Option, what entire frame w/suspension can be used to mount the cab and box (wheel base is 125 1/4 inches). Also it is 63 inches from mid tire to mid tire. Lookn' for the best options to put the truck back on the road safe. We appreciate all your help. thanks.