The underdrive actually hasn't affected it at all. It would charge between 13.5-14.0 volts and it didn't affect charging at all. I have a pulley alignment issue which may free up a couple tenths of a volt but I'll have to put the laser tool on there to align the pulleys.
I ended up getting a set of air bags for the rear, drag shocks all the way around, and then I picked up a set of Weld Prostars, 15x3.5 and 15x8 with 4.5bs. Bought a new set of 275/60 MT drag radials for the rear and the fronts have a 205/60. Mounted everything up, had to use a 7/16" spacer to get the rears to clear the frame. I think I may get a set of 1/2" spacers just to be on the safe side, even though the finger's worth of room seems good after driving around on the street and no rub marks.
I think I'm gonna have the car painted this winter, same color, body moldings removed and probably a better set of wheel moldings, and new bumper filler pieces.
That's really it. I was planning on maybe going with a custom ground cam, but I need to run the car down the track now the way it is to make sure I don't run faster than 11.50, this car is too nice to cut it up for a cage.
Thanks for looking everyone