'
Tough one and seems little info to be found less than 50 years later.
My Newspapers.com access still isn't working but fcs66 or other members can give it a go for you there.
Maybe you've seen them already but here's one of the '72 ads from Newspaper Archives w/ phone # that may help searching...'70 Duster ad and # looks like 239-0171?
Good luck also is it a Cuda?
~ Pete
.