If you drive the car to the track and don't want to have to jack it up to change the tires then get some drag radials.If you don't mind swapping wheels or trailer the car then get some slicks.Some 26x8.5x15's should fit your wheels and car without any problem.
I just put some 24.5X8.0X14 Mickey Thompson slicks on my car to replace the 215/60R14 BFG Drag Radials. Now the 60 foots are consistent at about 1.54-1.55. The Drag Radials were good for a best of 1.510 60 foot in cooler weather but weren't consistent. One run would be 1.58 the next 1.70.The car gets trailered to the track so the slicks aren't a problem.It has run a best 1/8 mile of 7.18/94+ (about 11.25 1/4mile) but since the rollbar cut-off is 7.25 and I don't want to put one in, it has been slowed down to run 7.30's.
http://bowtie0069.fotki.com/73108irwindalepix/img1101.html