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My trusty Galen Govier book says 1243 1972 Rallye 4-speed cars. No mention of engine sizes available.
My Govier book shows 1676 4-speed cars built, but they are all listed as " JH " cars. You'd think that the Rallye cars would have the " JS " designation. I do have an old book, though. Maybe the newer ones have a better breakdown. Hope this helps.