72 Duster twister with the 275 horse 340 engine?

Hypothetically speaking..... What if a few low compression motors slated for install on early 72 cars to meet emissions were painted orange because the factory still had LOTS of orange paint to use? Maybe we all are thinking too much into this....????

No.

The switch to blue paint 340's happened mid 1971 model year in spring 1971.

That would be like putting 71 side marker fenders on a 72 cause they had them left over. The companies make change overs and retool the plants for the new model year.

Many exterior colors available in 1971 where discontinued in 1972. So did they paint cars with leftover 71 colors? No.