I have to say, I think the viper is worthy as a classic, due to the fact it's an original car that's genuinely good, and for it's time, fresh
today the ford GT looks like the GT40, the mustang looks like the 60's one, the camaro look like the 60's one, the challenger looks like the 70's one. some may call this 'reinventing a classic' i just call it friggin lazy design.
Jaguar and Rover both tried this, to make their cars look like they were from the 60's and were both slammed for it. subtley changing an old design to make it look modern in an attempt to make people go misty eyed is just a way to latch onto sales from people that had the posters on the wall when they were kids. sometimes the results can be cool (Fiat 500) but they will never be true classics...
back to my point, the viper will be remembered as a classic considering it is still new, and the design is positively progressing as the years roll by, with the ACR a landmark in performance