1979 GMC Sierra Classic Camper Special k2500. Bought this truck from the estate of the original owner. She had a Mark 6, 454 ci long block bought new and installed by her mechanic. TH 400 trans. 4:11 rear end. Towing package. California truck bought in Bishop, CA in November 1978. Both gas tanks dropped and wash out. new fuel lines and filter. New Quadra-jet with correct jets installed. New CAT installed. New muffler and exhaust installed. New windshield. All stock. Have original A/C compressor and other parts. Heater was bypassed. Idles great. Smooth. Clean truck. Straight.