I know the 73+ cars never had SBJ uppers discussion comes up. Here's a post from another site and some interesting stuff from a parts book. There might have been some SBJ uppers installed on cars after 1972 model year after all.
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Had a 75 Dart Sport /6 3-spd with 9" drums and SBC wheels. Had the small upper ball joints too.
My 74 FPM shows for V/L cars
UCA w/dics 3402702-3
UCA w/drums 3722460-1