I am going to be getting into my 99 Tahoe at the end of the summer and I have been looking into going to an aftermarket intake manifold that preferably isn't the cast marine version. I am going to do a bit of headwork, intake manifold and a cam. I want to keep Air conditioning and Cruise control and I will use Bosch EV14 Injectors. These are a few manifolds I was looking at but some look like they might not be compatible with AC and Cruise because of the throttle body. https://www.holley.com/products/intakes/efi_manifolds/parts/9901-107 https://www.summitracing.com/parts/edl-29145/questionsanswers/ https://www.edelbrock.com/pro-flo-xt-vortec-sbc-intake-manifold-7138.html I pulled this from another site; "You would need injector connectors, that you solder into the big black Vortec connector wiring. Most are just cutting that connector off. Crimp, Solder, Seal. Attach a throttlebody and air intake. Drop in Vortec distributer and mount coil, or use EFIConnections CNP(coil near plug) setup and 8 LS1 style coil. PCM tune to disable EGR, and its OBD2 SES light, tuning for the IFR(injector flow rating) Attach fuel supply and return lines. Attach PCV line to vacuum somewhere. Attach Evaporative Emissions lines to vacuum, or disable Evap function and OBD2 SES light Hook up cooling system" So a couple of questions I can't find specifics on... First what is a good company that can tune the factory computer for the injectors and remove the EGR/EVAP function? Can I use all the other factory Vortec components (distributor to be exact). Has anyone used the Edelbrock Pro Flo with Air conditioning? What else might I want to think about with wanting to stay as close to factory with losing the poppet valves, getting more torque and keeping drivability?