What gear ratio for a street car w/occasional track use?

I have an almost identical set up as the OP with the exception of an automatic transmission and I'm running 3.54 gears and 28" MT drag radials. I would love to change to a 3.91 or higher rear gear, but I have to drive at least thirty minutes on the highway to get anywhere in this town and the nearest drag strip is an hour and a half away. Until I can add an OD of some sort, I'm sticking with the 3.54 gears.