I don't believe the V6R red stripe was ever available on a 70 Cuda 
Per the original owner, Richard Carpenter, who took delivery the car in April of 1970...
"In early 1970, during the time Karen and I were working on “Close To You”, I visited Lakewood Center Chrysler/Plymouth and special-ordered this car. I wanted the high-performance ‘Cuda, but with the luxury Barracuda “Gran Coupe” interior which consisted of a felt-like headliner, an overhead console with three warning lights and an alternate seat cover design with the front buckets finished in leather with vinyl trim, and the salesman stated, correctly, that it could be done. I also ordered power windows, AM/FM 5 speaker stereo, light package, "Elastomeric" front bumper, 440 Six-Barrel and Shaker hood, Rallye instrument cluster, and a number of other fairly rare Barracuda options. As this car was going to be paid for in payments, and my folks were going to co-sign for me, I didn’t want to push my luck and order the pricey 426 Hemi. (I really, really did … but I didn’t.) This engine was close to a thousand dollars extra and almost a quarter of the price of the car. I knew I was fortunate to be allowed to order the car at all, as we barely could afford it, so, no Hemi.
We took delivery of the ‘Cuda on April 10th..."
Without seeing the data plate, I guess we won't know 100%
