Need some assistance 70 vs 71 340 4 speed Duster

1971 Duster 340's also used a *specific 850 cfm Thermoquad. Not all 1971 Dusters have the ridged trunk lid, mostly later production '71's and become the standard deck lid style for '72-'76 Duster,'72 Demon, and '73-76 Dart sport.

IIRC, a '70 4 speed car uses a different style pedal rubber than a '71.

Ditto on all the other responses here as well...