ok im planning on getting a 350 to replace my 305. The 350 will be using a holley 670 cfm tbi(designed for 87-89 gm trucks). Will my factory ecm and wiring harnesses work? what else will i need to change?

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Edelbrock TES Headers, High Flow Cat, Edelbrock Catback, SSM Subframe Connectors

 

Here are a few ideas that will get you started. your ECM will work but you will probably need a custom chip for the 350.
You will need a new Knock sensor and I believe a few other sensors are different on the 350. There is a ton of stuff written about this so search the archives cause you will be able to get a complete list of all you will need. Some guys have changed the ECM to the Truck ECM for better tuning ability if you do your own proms. I forget the number of the truck ECM but there is a ton of stuff about this on the prom board. I have a couple of posts asking about this so check the responses to them. A lot of it comes down to how modified your 350 will be. If you do a LO5 caprice with few mods, you may ba able to get away with a GM prom out of an 89 caprice which uses the same computer. Good luck and search the archives and you will get most of your questions answered.......bob

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91 camaro RS L03 convert,
t-5, ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets