So here are my plans for the 68 Dart low mileage four door wife's car so far.

Darter6 said

I used a 1974 Dart big bolt pattern 7 1/4 under mine.Possible you might find 74-76 in HI ?

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I found a machine shop that will redrill my axles to 4.5, and not only that, has done it before! Wow- cool guy, most of his work is making doo-dads for the observatory.