On a B-body I would use at least 18x9.5 if not 18x10's in the front. Think go-cart like in terms of response. 275-295 wide tires in the front and rear or 315-335 in the rear. My Dart has 18x9 275-35-18 fronts and 18x12 335-30-18 rears. It does things a Dart never should.