id do up your 2.3 like he said above. would be the cheaper route and would be stuff you could do here and there and still be able to drive your truck every day. imagine that thing with big cam ha would be pretty cool.
check these out, pretty cool for 4 bangers.
th idle on this one is pretty cool.
this one is cool, built 2.3 with i think a 2.5 crank and bored/stroked, but a hotter cam
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oh heres a seafoam thing i found
would be good to do this BEFORE you do sparkplugs, heard it can foul them out on SOME vehicles, but most ppl havent had a problem