My advice, don't go smaller then a 3.5" More engines have been wrecked with a 3.4" pulley then any other mod.
To run a 3.4" here is what you will need. A scan gauge. Any time your smaller then 3.5 you should be scanning for knock retard. A shift kit, yes, sounds funny, but it does help a bit. A performance tune, even a canned tune will help. Where are you located, might have a tuner near by. High ration rockers, like 1.9:1, or better yet, a cam. And some kind of exhaust mod. PEMs are cheep and easy, but not real good, better then nothing, PLOGs, better then PEMs, or headers, best option.
SAVING THE WORLD ONE BONNEVILLE AT A TIME
1997,1998,2000,2005 year confused Bonneville SSExi. Stock? ish.
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