i use a Hancook or Kumho 185/80R15 on my 68 Satellite . I have also fitted these on an Aust Valiant - similar/same as a 67-69 Dart
Neither have had clearance issues . I use a 4" rim the Valiant a 6" rim

Tex

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New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive