71 4dr Dart 318 w 4bbl

I would say anything 1972 to 1974. I look for the ported vacuum tap so I can run vacuum advance. 72 340 auto carb was 6139 and 73 340 auto carb was 6319 if I remember right. I have misplaced my numbers book... really any small block TQ will work. Big blocks were richer in mixture out of the box. The inlet should face at an angle and have 2 pressed in rear vent tubes. The later "lean burn" carbs had too much emissions junk and no ported vacuum. I think RRR did a TQ rebuild that has some great tips.