35k Miles! Originial Cab and Chasis

I am selling a 1979 Ford, F-350 Dually.
It is a white single cab with a utility bed and lift gate. Lift gate does not work. When I purchased in 2009 it was functioning. Seals in pump needs to be replaced and I believe all will be in working order.
This has a strong running 400 engine with an automatic 4x2 transmission.
The 10 years I have owned the truck it has been sitting. We pulled it out cleaned out the tank, put fresh gas, replaced mechanical pump and got it running nice. We also replaced the push rods, thermostat, thermostat housing and rebuilt the carburetor.
Air condition blows, but will need to be charged.

I purchased from an auto auction in 2009. When I purchased I was told it worked on the tarmac at FedEx and ORIGINALLY only has 35,xxx miles. Does not have a catalytic converter and I do not believe it has ever been registered to be driven on the street.

This is a solid truck and runs nice. Will need more work due to age and been sitting for so long. It will need tires.

Asking $3950 or BEST OFFER!