I sold my 91' for $3000 and the only things it needed were cab corners, heater fixed, and a paint job. Everything else was like new, new or moded and it ran like a bat out of hell (138K on truck and 22K on motor since rebuild). So an 88' with that much work needed? I'd say $500. (I actually could have gotten more if it wasn't 0 degrees outside and the heater in the truck worked).