I do have a crude spreadsheet that I made years ago that calculates inside tire clearance and overall width from entries made about the car, tires and wheels. I have used it on a lot of cars with pretty good sucess if you want to give it a try.
I have a set of 295-55-15 drag radial’s on some Crager 8” wheels that you could put under the car and make some difference calculations from.
"One test is worth a thousand expert opinions"