73 Plymouth duster question

[Paul Ceasrine]

The right 340 combo for 1970 340 with the Carter AVS carb,
The right 340 combo for 1971 340 with the Thermo-quad,
Tail-lights are also different on the Dusters,
I would say, 'can' the Demon experiment, and stay with the option on the Duster, for 70 or 71.
As for the 318 2- barrel/230HP rating in the early 70's. A 'Bad' combo
in K/S and later L/S.
PC