Everything I listed can easily be installed in a days time. You might fight with the heads and cam if you have never done it before. I believe if you did the heads in the truck you would fit a living hell getting around the brake booster on the firewall.
Do you have a muffler on the truck? if not. I would get a muffler on there as the 4.3 does like a little back pressure. No muffler is all noise over power. A stock muffler is better performance on the 4.3 than none at all. You can look at spintech, dynomax, maganflow, gibson etc. And if you must a flowcrapper. lol
Headers would be alittle fun as well. But no biggie. If you were closer I would be more than willing to help you out.
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