I fell in love with a set of wheels that were not available narrower than 15x8.
For the rear, these have a 0 offset (4.5" backspace). The front wheels have a +10 offset (4.89" backspace).

The car is a '73 Dart Sport with front disk brakes.

I'm looking at 255/60/15 rear (which I'm confident will work) and 235/60/15 front. Would that work or would I need to step down to a 225 on the front?

Thanks for any advice!