Ervin Rigsbee of Rigsbee Auto Parts in Raleigh has a few old trucks for parts at his Highway 64 East location. I have purchased a few task force Chev. parts from him. He keeps most of his old trucks in the back pasture area of his farm just behind his salvage place. At that time, about 7 years ago, he had an LCF task force fuel delivery truck plus several others. He may have earlier trucks available also. Ask for Ervin himself at tel.#919-266-3333.
Another source is "Junebug" Greens Salvage in eastern NC. Most of his salvage is early heavy trucks, but he may have light trucks also. I have not dealt with him but I understand he has ALOT of trucks!! I don't have his tel. number.
Hope this helps, JAMES