ReD0917

I have sportline springs on my '93 z. 1 3/4" drop at front. And 1 1/2" at rear. I'm about ready to get some rims for my car. But my question is which will rub more. Here's the tire sizes I'm thinking of. 265/35/18 f. and 295/35/18 r. Or 275/40/17 f. and 315/35/17 r. Anyone have either combo with the same type of drop springs? BTW I am planning on rolling my fenders,massage the inner well, grind off the bumpstops, and get a adjustable panhard rod to get the rear aligned. I just want to know which will give me more problems as far as rubbing concerns.