Hope these are correct. From 1970 and 71 parts catalog:
70 2 dr HT 318 and 383 w/o h/perf #3420174
70 CV 318 and 383 w/o h/perf #3420175
70 2dr HT 340 and 383 h/perf #3420179
70 CV 340 and 383 h/perf #3420180
Heavy Duty
70 2dr HT 318 and 383 2bbl carb #3420179
70 CV 318 and 383 2 bbl carb #3420180
70 Extreme Duty 340 and 383 #3420176-7 (Catalog shows quantity of one.That number also appears under 70 CV 340, 383 4bbl carb, 426, 440.)
No mention in parts catalog of models like RT or SE.
Hope it helps.
