The GMC with the camper package will say "Camper Custom", rather than just "Custom". The GMC used leaf springs on all models, exept mayber for some 1/2 tons. Chevrolet used coils on both 1/2 and 3/4 tons, leaf springs were optional on 3/4 ton, usually with the Camper special package, and were standard on the 1 ton and 3/4 ton w/Longhorn package.
big ragu, the Camper Special, which as I noted was built in both coil and leaf spring variants, would have had a TH400 originally, especially with the 400 engine, which was actually the 402 big block.
