The A-bodies have it 'bad' when it comes to tire-width upgrades.
My DIY C-body rotor discbrake 'upgrade' made the Dart's trackwidth about 3/8"(?) narrower on the front (compared to the stock '73 discbrakes).
Not so desirable for handling, but in this case 'very welcome' when you want to install wider than stock tires and dealing with wheels that are only available in fixed backspacing/offsets.

The Michelin's (or any other good Brand-name tire) were a welcome upgrade to the BFG's I used to use years ago.
I usually buy my tires 'used' in pairs from the local classifieds, as long as they have enough profile to be run a few years.

I'd love to run wider tires under the car, albeit mainly just for looks, but I also know things can good bad quickly with wet roads and wide tires.