72 Duster twister with the 275 horse 340 engine?

I will add my comments for whatever. we all know the 340 was detuned to meet gov't regs. and that Mother Mopar used up leftover parts, from one model year to the next. and that gov't reg for Canada did not necessarily match those for the U S?
i'm not a purist or number cruncher, but it has always been interesting to me, since the mid 80's, to learn some the paticulars of this hobby. I have had originsl cars back decades ago, that we cars not offered by the factory, but we without a doubt as came from the plant. ie 69 roadrunner, black car with blue int. yes documented by all the buildsheet and tags. just an example.
younger folk that weren't there back then, realize this. these were JUST cars, the so called muscle car could have had the original engine blown up with no warrenty, and a quick trip to the boneyard would yield a replacement engine, probably different than what came in it originally. people added stripes, updated parts, whatever.
and mopar was very eager to make the customer happy ( back then). a car could be ordered that wasn't available.. the example of the black road chicken with the bleu int. ( as yes it didn't not look pretty, to me.)