Taller or shorter tires for the track?

I am hitting the track this Sunday. I usually switch to P255/60R15 Mickey Thompson ET street radials. They are 27.01" tall. They hook very well. I typically drove on BFG Radial TA on the street, but this year I went to Nitto NT555R extreme drag radials for every day tires and they hook well on the street. I am considering leaving them on for the track. They are P275/60R15 and are 28.00" tall. What will this do to my times? Faster or slower? I run 4.10 gears and I have an overdrive transmission, but i never get into overdrive in 1/4 mile. Curious to hear the comments.