id run 28" tires all the time at that point. i hate chaging tires in and out. 1 of the huge reasons i run radials on my car. that and they are faster and more stableI would never gear up and run a 28" tire for the track. Just me personally, but in doing so, you now need to adjust your street tires to make up for the gear change. A 28" race tire looks good, but a 28" street wheel/tire set up, can't say I'd like the look.
My suggestion is keep it 27" tire or less.
as for the 28" street tire look 295/45/17