The 383 was the base engine in the ‘70 RR. The only other engine options were the 440 4 bbl, the 440 6-pack, and the Hemi. The only automatic used on these engines was the A727. 3.23 was the standard RR ratio, but other ratios could be ordered.
It has a 383 (matching numbers)727,power front disk brakes, power steering, Factory Air, and Power windows. I am told that it was on the production line to become a SuperBird.