Correct Electronic Ignition box location on a 1971 Duster 340.

Same place as a 72 a-body I would imagine. I never saw electronic on a 71 340 car though. Most all of mine had dual points

I think 72 was the first year for electronic ignition. And then only the 340 and the 440 got them. I believe by 73 most everything got electronic ignition.