Okay, starting from the top.
1) A good tune up with quality components. MSD 8.5mm Super Conductor spark plug wires, good quality cap and rotor, MSD high performance coil (I think they make one for your engine, I have on on my 350), AC Delco spark plugs (the basic cheap ones, the all are about the same) that are gapped .010 over, so the gap is at .045 (I can do this because of the MSD wires and coil), good quality AC Delco spark plugs, Mobil 1 or AC Delco oil filter, your favorite oil, Bosche oxygen sensor, new tranny filter and tranny juice if you have an auto, new gear oil if you have a manual. Probably wouldn't hurt to lube up everything that has a zerk and change your differential and transfer case fluids either.
2) An improved air intake, ranging from just a drop in K&N air filter to the cold air intake system I have from http://www.ramairbox.com
. This always helps.
3) High performance throttle body from http://www.TurboCity.com
4) MSD ignition box, I am going to get the Offroad model, but they all are good.
5) Headers. I like the JBA ones, but it's really up to you because you know what you want them to do for you. Whatever you do, get them coated with the AirBon or Jet Hot stuff. It makes it so your headers won't rust and don't retain as much heat. Adds a bit to the intial cost, but is worth it in the long run, since you aren't replacing headers every few years (or months, depending on your location).
6) Go to your favorite exhaust shop, and have them make you a custom exhaust, with as few restrictions as possible. Make sure it is all mandrel bent, none of that hardware store kinked pipe s#$t. I'm not certain if your truck has 1 or 2 cats stock, but if it has one you can <font color=red>legally</font color=red> only have 1 pipe. If it has two, then you can <font color=red>legally</font color=red> run duals. Whichever, get some high flow catalytic convertors when you do. Some good mufflers help too. I have a 3" in/out Flowmaster 40 series Delta Flow muffler. Not extremely loud, but definately loud and sounds great. Having a good exhaust shop that you trust will result in a better exhaust than you could ever buy from a kit, and also will more than likely be cheaper or the same as just the purchase of a kit. My advice though, stay away from cherry bombs, glass packs, Gibson mufflers, and Borla mufflers. Just not worth it.
7) I dunno if Edelbrock offers one for your 454, but they make a Performer series intake manifold for my TBI 350. Just bolts on in place of the stock manifold, and everything else just attaches to it like they did to the stock manifold. Good thing if they make one for you.
8) A high performance chip. I like the ones http://www.fastchip.com
makes. Unlike the major name brand chips, Fastchip's do not require you to run 92 octane (<font color=green>$$$$$</font color=green>) and offer performance increases all through the rpm range, not just at the upper ranges where 4x4's never seem to be.
I have the air intake with K&N filter, MSD 8.5mm wires, a 1" TBI spacer, the MSD high performance coil for my truck, a 3" mandrel bent exhaust pipe from the Y pipe back with a 3" in/out Car Sounds catalytic convertor and the Flowmaster muffler I mentioned above, Mobil 1 5w30 full synthetic oil with a Mobil 1 oil filter, Mobil 1 synthetic Dexron III ATF fluid in my transmission and transfercase, a Bosche oxygen sensor, and Mobil 1 75w90 synthetic gear lube in both differentials. Everything else I want to do, and will do as soon as I find that million dollars I left somewhere.[img]/wwwthreads_images/icons/tongue.gif[/img]
1992 Blazer Sport, 350 TBI, 3" Flowmaster 40 DF, 4L60, K&N, Rancho 2.5" lift, 285/75R16's on 16x8 Bajas [img]/wwwthreads_images/icons/laugh.gif[/img]