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Dang, I'm too late.
Good luck with the 3" drop, I would have only recommended 2". Some guys say alignment with 3" coils is no problem, others have a lot of issues. Also 3" in the back puts you about on the bump stops. It's the point where many guys will start to channel the frame to give the axle more up travel. We did 3" blocks on a buddy's Sonoma years ago and the back bottomed out everywhere.
Shocks shouldn't be too much of a problem. Since the bumpstops aren't moved (you are only riding lower in the travel) the compressed length of the shock will end up the same. Its just that drop shocks usually are stiffer and better control the now very limited up-travel.
I had a 98 S-10, 4 banger 5 spd. Dropped it 2" with coils up front and blocks in the rear. Ended up adding air shocks, as the truck was worthless once dropping the back. 300 lbs worth of dirt bike and gear would leave it squated and bottoming on everything (not that it was much better stock).
I am surprised your mileage is that low with that truck though. 25 mpg was probably one of my worst tanks in my 98 (granted the head/intake/exhaust is a little different).
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