Wheel size.
When I got my '71 Dart GT it had 14" X 5 1/2" factory Rallye wheels. The front tires were 215/70R14 and the rear tires were 225/70R14.
The car has the factory installed 8 3/4" with Mancini Racing 2800lb leaf springs.
The front suspension has been rebuilt (with Moog stock replacement parts). I also updated the front with SSBC disc brakes (which pushes the wheels outboard ~3/8" per side if I remember correctly). The passenger front tire did rub a little during a hard right turn.
I have replaced the tires with 195/75R14 (front) and 215/75R14 (rear). The passenger front tire does not rub anymore.
Spring of 2021 the rear wheels will grow to 15" X 7" Rallyes wearing 245/60R15 tires.