[PeteLeathersac]

Rick's right on w/ his thoughts as usual also best try back-tracking from a few other angles too.
And when searching it's best keep what you know of the VIN in mind as the # alone may be on a loose paper or file folder edge etc so knowing it's # 136379B......or whatever, hopefully it stands out.
It wasn't a 2-Dr. Post car by chance was it?
And even though your pop was owner #2, was there an emblem or info in the car indicating dealer it came from new?
And whether you know anything of what dealer it came from or not also considering dealer trades etc, it may be worth trying Sweeney Chev in Youngstown on for info plus any other old dealers still operating in the area too?
Lastly and slim chance perhaps but if the car lives and current owner does an NCRS report then shows up here or elsewhere mentioning the dealer name, someone may recognize it?

Good luck!
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete