Sounds like from the placard description that it was probably the Billie Harvey car.
http://randyayersmodeling.com/modelingforum/viewtopic.php?t=51443&highlight=billie+harvey
Kind of odd how it was redone as a Tim Richmond car though. I believe all of the original Tim Richmond/Blue Maxx cars started out as Regals and Cutlasses in 1981 (M.C. Anderson/Cale Yarborough). Then when M.C.'s operation closed and was taken over by Raymond Beadle, the chassis' were reskinned to Lemans' after they were legal again to use. Then through 1984 Pontiac urged the team to use the Grand Prix body as the Lemans hadn't actually been in production as a street car for a few years. By 1985, all of the cars were reskinned as Grand Prixs.
Compared to the "competition" at the time (Thunderbirds), the GM Gbody cars really were stock bodied. The front fenders and 1/4s were basically handmade, but every other part of the body was a factory piece. A lot of times the trunk lids still had the original bracing.
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