I have a 97 Sierra with a 5.7L, rcsb. What I have done to it is, true dual exhaust, k&n intake and 180 degree thermostat. When it gets a little nicer out, I'm planning on doing more upgrades to it. Here are a couple of my plans let me know what you think. Underdrive pulleys, Nelson tune, MSD plug wire with Boush +4 plugs, Headers, also maybe posi track with 373 gears. Tell me what you guys think? Also if you have anymore tips I would appricate it.

It all sounds good, except for the Bosch plugs. You will have nothing but problems if you use these plugs, have not heard of anyone that actually liked them.

Yep, better keep AC Delco plugs in a GM truck.