Some more information:
The drag coeffiecient of a 92-99 Bonneville (no distinction made between the different frong bumpers) is .360, and the frontal area is 24.3 Sq/Ft. At 140mph (breakout speed for the 130 class at Speed Week), aero drag is costing me 160hp. This doesn't seem bad, but keep in mind that heat is a factor also. I'm assuming that'* costing me 160 wheel horesepower, which is about 200 crank hp.
Now for gearing and such......
Using a gear ratio of 1:1 for the final drive (3rd gear since I'll never see OD), 2.97 gearing, and 225/60/16 tires, I'll be running at 5251 rpm'* to maintain 140mph. (757.63 tire revolutions per mile for those that are interested).