quick question.short answer plz

Rear fenderwell yes. Front fenderwell probably not.
I’m running 15x8 with a 265/50 on the rear and 15x7 with a 225/60 for the front - everything stock, BUT I have a Barracuda that seems to have a bit more room in the fenderwells.
Of course you could run lower aspect tires if you can find them in 15’s, however 70 Dart fender wells were designed for 14x5 wheels so 15x8 is a stretch.
OK @72bluNblu bring it!:D