You won't gain anything from the electric fuel pump unless your old mechanical pump was in real bad shape.
The water pump should drop a tenth or so in the 1/4 mile, if you were also previously running an electric fan. If you're removing a belt driven fan AND water pump, then I'd expect .2 to .25 ET reduction.
Not sure on the underdrive pulley, but I wouldn't expect much.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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