Yes, there are very few correctly restored RR’s or any other 68-70 Bbodies or 70-71 Ebodies for that matter. Parts are expensive. For example, a real, operating six pack/six barrel idle solenoid for the center carb will set you back $400-1,000 dollars. NOS dual point distributor $1,000. And remember, unlike GM, Mopar date coded virtually everything including hoses and spark plug wires in addition to alternators, radiators, etc. Then there is the simple matter of scarcity, Compared to a Chevelle, the starting number of these cars was meager at best, and relatively few have survived. And those that did survive have been modified over the last 50 or so years.
I have an original sheet metal, original drive train AAR 'cuda that I have been bringing back to bone stock. It has been a labor of love in addition to expense, and much time spent on documenting what was done originally (and I’m referring to parts, manufacturing line marks notwithstanding). When I am asked to look at other AAR’s out there, 95% of them are missing parts or have incorrect parts installed. Has to be the same for RR’s and even worse for GTX’s.