I have been researching these cars for almost 30 years now. Have always thought that they were somewhat "special" . . . even though they were basically trimmed-out Polaras, they seemed to pick up a lot of the styling cues from the turbine car (4 buckets, console thru to the rear seat, circular pod dash, etc).
Anyway, I went back through my files this weekend, and did some number crunching. Was able to calculate approx. 75% 383s, a little over 21% 413s, and under 5% 426s. May be off a percentage or two from Chrysler production numbers . . . but, I'd bet that I'm not far off.