I second that welcome to the group! Is your car an real R code hemicuda, or a clone? If a clone, are you using a vintage block or crate?
I believe the early build 70 red cudas used red shaker bubbles but after they found issues with the red clinging onto the shaker material, they switched to argent only. Black came in '71 but it is your car, your preference!
Post your data plate if you can...there are gurus here like you would never know who would be able to build your car from the codes. Have you located a broadcast sheet yet, if not, and if the car still has its original interior handy, there are several places to look.
Finally......to say the least