this would not be a good idea the correct tire size would have to be 285/30/22, now thats around a 9 1/2" rim and you're looking at no ride quality at all, I mean damn near not sidewall to support the weight of that car. Plus you're going to have to lift that car signifigantly to get those to remotely fit.
If you mean your lug fitment, then your '93 Caprice should be a 5x120.65 cm (aka) 5x 4.75 in. Tire sizes vary, depending on whether they are gonna rub the fender wells when you turn the car. 255/45/22 should be alright. You might be able to fit a 265/45/22. You may need a lift on the car to fit these badboys that you want.