Improved reverse engineering the Coronet, IMHO would make more financial sense for R2 than an all new kit, cuz if they play their cards well* 2 kits can be sold; the new an improved "original" and a Ertl engineered Plymouth late '60s RR/GTX
(*)By including a advanced modelers tip on the instruction sheet, on how to build a better detailed replica.
A similar approach can be taken with the original, '66 Comet, '67 Fairlane, etc, etc...