I have a 1968 Chevrolet K20 3/4 ton, 4wd Panel Truck.  In 68 Chevrolet made 69 of these trucks.  Only 78 of them were ever produced in the 67-72 body style.  I have looked long and hard and not found another truck like it.   The truck is extremely rare.  It is prime for a full restoration.  Can anybody tell me what the truck may be worth?  Maybe refer me to resources that may help me?