The Galen Govier books should give you an idea of production numbers of your convertible with your engine and transmission combination. But beyond that I think you're out of luck. There may of course be some kind of percentages of 67 Plymouths were painted red, what percentage of 67 Plymouths had the sure grip rear, and what percentage of 67 Plymouths had black interior. But even if Chrysler can provide those percentages, none would apply specifically to 67 Sport Fury convertibles.
Locate a Galen Govier book that covers production figures for the model year of your car, and just be happy that you can find out how many 383 2 bbl automatics were made and how many 383 2 bbl 4 speeds were made, and how many 383 4 bbl automatics and how many 383 4 bbl 4 speeds were made.