I got my L59 with all accessories, harness, and ecm for $600. I cut down the harness and married it with my factory harness. I also extended the harness and ran it behind the engine so that I can mount the pcm in the cab. A lot more work and very time consuming but it gives a very clean look in my opinion. I used dirty dingo adjustable motor mounts and their R4 AC bracket to keep my original AC, you may have to get a custom length low side line. You'll need a EP-381 fuel pump, it'll fit your sending unit. Your factory power steering lines will connect to he gen III pump with no problem. Schoenfeld LT's are the best fit as well and they're priced really well if you don't opt for the ceramic coat but I've been told factory truck manifolds will clear. Keep your factory 28" radiator and get some F-body electric fans. Both V8 and V6 have the same fans. Or find a 2005 tahoe and get the radiator and fans. With a little trimming, the radiator will work. You'll have to extend your heater hoses and get a Tee to tie in the steam line from the heads or drill/tap your water pump. Get a cheap ebay CAI for a truck. When it comes to fuses you can either make your own fuse block or wire everything in and use your existing fuses and fuel pump relay. Use all your factory sending units that way your gauges will work right if you're keeping your factory gauges, you'll just need some adapters. Lastly, get a good tune like a Nelson Performance tune and you'll be good to go! It's not all that hard, the wiring is the hardest part if you're making your own harness. Hope all this helps