Mods
Low 14's, possibly high 13's if the wind is right.
You need the 3.73 rear gears. They can be worth three tenths, sometimes more, but you have to re-learn how to launch the car without giving up traction and losing the torque multipication advantage the gears offer. I would do the gear upgrade before messing with intakes, but to answer the question:
Underdrive pulleys will help, (maybe a tenth or two) the intakes won't hurt but the bigger TB won't do much, if anything.
If you don't burn oil or have any noticable problems then you can put off a rebuild awhile longer as intake and exhaust mods won't really strain the engine and new valve springs will help.
Once you're ready for aftermarket heads and possibly a cam, then think about a rebuild kit.
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