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Unless they were running short of 741 cases at some point, I would venture to guess that the 489 probably came behind a HP383, HP400 or any 440. Maybe 340s, maybe not every year's 340.

This is mostly a guess, but there are a lot of 741s out there, same as there are a lot of 318s and slant sixes. I've never seen one (489) behind a 318, although again, Mopar, never say never!

I'm sure someone else will clarify things.

R.


I have a 72 duster with /six three speed with a 489-323 limited slip factory installed.