i'M PUTTING AN LT1 IN MY 91 TPI FIREBIRD. I NEED TO KNOW WHAT PARTS OF THE OLD WIRING HARNESS NEEDS TO STAY IN AND WHAT SHOULD COME OUT. WIRING DIAGTAMS WOULD BE HELPFUL. THANKS ------------------ 91 FIREBIRD RED WITH BLACK STRIPES GTA RIMS WS6 SUSPENSION TRANSGO SHIFT KIT B&M STALL CONVERTER IGGY'S 3 INCH EXCELERATOR EXHAUST HOOKER COMPETITION HEADERS AUBURN POSI 3.73 GEARS

If you want to go the quick and dirty way Painless wiring offers an LT1 swap harness. I guess their kits are real slick with the wires color coded and labeled from them. if you don't want to go that way you will need the complete powertrain wiring harness. Make sure to label the wires when you disconnect them. I would recomend a factory manual for it's wiring diagrams.

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

I used a factory harness. a little more time consuming, but 600 for a painless. I extended mine, just do one wire at a time. what you need to keep is dependent on how you have your ECM programed.