In 1970, Plum Crazy was one of the most popular high impact colours. Chrysler never kept records of how many cars had both options....By that I mean
You can find out how many 440+6 Challengers there were, and you can find out how many FC7 Challengers there were, but you CAN NOT find out how many 440+6 Challengers were purple. It's safe to assume...A LOT.
Think of this...Of ALL 1970 Challenger R/T's 3856 were painted Plum Crazy....That's well over double of the next closest colour which was Burnt Orange at 1708 R/T's
Having a FC7 1970 Challenger is a curse in the collector's market.
Fully restored your car may fetch $75K on a good day, but that's not very likely. You're most likely in the $50K-$60K range.