The Gran Coupe is the step up luxury version of the "BH" model. According to my 1970 sales brochure, its "Our luxury/sports/personal car." Has leather seats, roof mounted consolette, and wire wheel covers. So it does not matter if you get a BS, BH, or BP, the body is the same. The consolette had Low fuel, Seat belt, and door ajar warning lights. Kind of like the Challenger SE model. You can email or call the seller for more info. At least this vin is clear in the Registry. I see the Liberty lake location is a small town and hope you find someone to look at it.
Or I used this service (link below) when I looked at a Challenger in Georgia. The inspector they sent took a lot of photos and wrote up a good report with good and bad things. I was going to buy this Challenger but the seller sold it to someone else. It is worth it for the money, cannot remember what I paid, but somewhere around $300. See the sample report. If you can get this under your budget, you can tune it very easily (whatever tune means to this seller). He lists a ph#, vin, videos, looks good. If for some reason you bid and win, ask the seller if you can inspect before pickup. If inspection is satisfactory to you, you will buy, if not sell to second highest bidder. You can also read his feedback. Keep us posted.
http://www.cars-on-line.com/insp-1stpg.html