Considering your location, the condition of the truck, the year of the truck and the modifications done to it, I would say you were about dead on with your $2000 offer. You are planning more of a rat rod and this is an ideal candidate.
Bringing this back to the original state would be costly and time consuming finding the correct 2 year only parts. The new exhaust is good, I bet it was installed to sell because the exhaust fumes were coming in through the floorboards and rust holes.
Make sure you check out the wiring, windshield wipers, heater etc. Those parts can be expensive to buy. Does this truck have to pass an inspection with the title change? If so, make sure that is part of the deal. Good luck! ...........g