You'd probably want to ask Butterscotch71 (aka Eric). He collects info for 71-74 Plymouth B's. I doubt you'll find an option breakdown, but he could probably tell you how many 400-4, 4 speeds were built. I just sold an EV2 72 RR, 400-4, auto, non-air grabber. You may want to check out http://www.roadrunnernest.com/