Tire sizes on stock rallye wheels.

MoparLeo said

The Factory Service Manual shows the largest stock size to be an E70-14 on a 5 1/2" rim. w/sway bar and H.D. suspension.
So with a factory rim a 205/7017 would be the factory equivalent today. The 215/70-14 would probably be the max with no mods to the car. You have very limited clearance on the front because of the cars wider front track.

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The track width depends entirely on what front brakes are on the car, since we're talking factory 14's on a '72 we know it's SBP so there should be room outboard to the fender for a 215. But a 215/70/14 is 26" tall, which is pretty close to as tall as you want to run unless you change the backspacing up or run a narrower tire than that.

I have run a 225/60/15 up front on a BBP disk brake car with a 15x7 and a 4.25" backspace, which is about the max for a 15" with that backspace. But the track width is wider with the BBP disks than anything with SBP brakes. The 225'/60/15's are also a bit shorter though.