What size were stock ’73-4 Dart Swinger wheels?

I'm hopefully picking up a new to me '74 Swinger tomorrow that has ill-fitting after market wheels & tires on it. Both front and rear tires are hitting the fenders. IIRC tires are 15" x 235 R15's on ?? Center-Line style wheels. The car is a factory 318V/8 Auto with disc brakes.

What would be the factory size wheel & tire combo? Any guesses on the widest rear I could run, and what tire rim / offset I would need to run it? These tires look like they would fit (in the rear) with the correct offset rims.

Thanks, Ken

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