quick opinion on ralleys

[GM Muscle]

Ok.. so im selling the fats and skinnies off my car and i plan on putting the factory ralley wheels on the car.. i belive they are 15x7's.. this is just temporary until my 17s and 18s get ordered.. the front of the car is pretty low(tucks about 1/2 and inch of a p165). i was wondering if any one knew off the top of their head what the best size tire to run is.. i was thinking a 255/60/15 in the rear and 245or35/60/15 in the front.. do you guys think ill have to raise it back up or will it fit? is the 60 series side wall too much for a cornering car? i plan on selling my wheel TODAY and i have to put new tires on the ralleys.. any help would be appreciated.. btw. they have 215/60/15's on them right now and they make me gag..