My plans for my 69 Dart Swinger 340

Will_H#24 said

That's the look I want. Maybe not quite as high in the front.

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You can stick with a 14” rallye wheel on 11” mopar disc brakes I believe, because they are steel. I wanted aluminum rims and those often run into clearance issues with the caliper so I went to 15” and then was railroaded to a 26” tall tire because tire manufacturer options. No regret but had I chosen factory steel wheel options 14” would have been a choice I believe.

You can keep your rear bolt pattern and only change the front wheels for the new disc brake pattern, as the 14” rallye wheels were available in both patterns. And it won’t matter because if running two different tire sizes you aren’t rotating anyway. Only issue would be the spare.