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The old tires were Pro Trac N50's that are about 27.5" tall and they would spin constantly through second gear. My best time with them was a 12.78 at 109.49 mph with a 2.02 60 foot time.

I just put on MT ET Streets, 275/50/15, which is 26" tall. I'm headed to Island Dragway tomorrow for a track rental and wondering what I should expect?

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I would expect a 1.6 to 1.7 sixty foot time and similar improvements in the rest of the run. I have seen a 1.5 times improvement on the sixty foot improvements on a lot of cars at the track, in other words they pick up a tenth, .100 in the sixtys and saw a .150 improvement at the /4 mile ET and one to three MPH improvements. Let us know your improvements