[Boog]

The thing about old vehicles is it could have been sold numerous times over without ever being registered so it could be anywhere in the country or out for that matter. I may be wrong but isn't the vin number too short on these trucks for car fax to search for?
Your best hope for help in tracking it down may be someone in the police department or an insurance office. I would think in these modern times there is a national database of automotive records to search. Since you think you have the vin to search with. Could it be there are some old license registration certificates or insurance certs for the truck in a drawer or some place at your Mom's where they used to keep such things? Maybe an old license plate? Something with correct vehicle description and full vin number, ect.? I have always held onto a few things like that. With correct information someone willing at the DMV could do a title search.
It is/was a good looking truck and I sure hope you find it and can bring it home again.