i don't know if it will fit on your 88, i have 9 inch rims with a 255 on the back and it bubbles out a little. i left a pic for u to look at of my car with a 245 on the front. both pics are with 245 on both front and back, i have since put 255 on the back and 225 on front. IMO i wouldn't put a 255 on the front.
Yeah, they will fit, but they will rub. I had an 87 with 245's that was lowered 2" and they rubbed pretty bad, but they look really good. My springs is what made it so bad. You shouldn't have much problem if it is stock height. Gonna rub a little, but it will look better than the 225's that come on them