I have had BFGoodrich P265/50R15 tires on my 1980 Monte for some time, This tire is 25.4 tall and 10.43 wide. The width looks awesome, but needs to be taller to fill the wheel well openings better. The 2 tire profiles I am looking at are: P255/60R15 which is 27.1 tall x 10.2 wide and P275/60R15 which is 28 tall x 11 wide. I am trying to cut down engine RPM's with a taller tire and give a much better look. However, I am worried with the larger tire I could have rubbing issues with the quarter panels, and/or the exhaust tail pipes which curve behind the tire and exit to the rear. Any opinions or pictures with these combinations on your G-body?