My 67 dodge coronet went 11:40 with a 4.10 28" tall radials, went to the 3.55 went out with the same tires, ran a best of 11:58. The 60 ft dropped almost a tenth. But for street driving it was a god send.. I did later switch to a 26 in tire and got some of it back. IIRC it went 11:47. I would have to dig out my log book to be sure though. Good luck.. Have fun