If you use wheel spacers, make sure you look up the torque specs, and look up what kind of thread lock you’re supposed to use.
When Ford/Lincoln designed my Continental Mark V, they were working on an agreement with Michelin to design special wide wheels and tires specifically for that car. Michelin never did it, and Ford used turban wheels from the parts bin. If you think about every one you’ve seen with the original wheels, the cars look great, but they look like they’re sitting on rollerskate wheels, tucked in too far.
I think the original tires were 225/75/15. I put on some 255/60/15 (??), but then the tires didn’t clear on the inside. I got 2 inch wheel spacers and put them all around. The set up looks great, it looks like what it’s supposed to be from the design of the car. Everything cleared when I tested it in the driveway, But if I am driving, and I make a hard turn to left or right and hit the slightest bump, the front tires will scuff the inner fender. I bought some inch and a half spacers to replace the 2 inch spacers a couple years ago, and I think I’ve got two or three years before I have to put them in…
From the safety standpoint, I vaguely remember that the spacers were supposed to be torqued to something like 120 with red thread lock, and then the wheels were supposed to be torqued to 90 with no thread lock or blue thread lock. The concept is you want the wheel to come off before the spacer comes loose.
Point being, don’t just check your clearances, check your clearances including the up-and-down vehicle travel relative to the wheel spindle.
My two cents, hope it helps