From what i recall, the floors and frame rails seemed OK. Once the car is blasted or dipped, you'll know exactly what you are working with. With it needing quarters and door skins, you can expect some of the other sheet metal needing replacing. This car deserves a correct restoration. The plus is the car has the original engine, trans, body, rear axle assembly and fiberglass. As with most 47 year old cars, everything else will have to be restored, rebuilt or replaced.
Unfortunately the X code only came in automatics or this car would be in my garage.