I'm new to this sort of thing and I don't want to mess anything up so I'm going to try and use as give as much info as possible. I have a 67 chevy 350 that I plan on converting to EFI. I've done some research on finding a good kit but I what I want to know is if I have an 89 iroc z with a 305 TPI could I reuse most of the wiring and sensors or would I have to get a whole new set up for it. I've been looking at kits and some of them do and don't come with certain sensors and if I could save money by not buying all new sensors I'd like to so that instead.

 

Is the swap in the 89 or a different application? You can use the harness and tpi but do you have cam specs on engine ?

 

ok so the swap is Into the 89 and no I don't have the cam specs

 

If your going to use the tpi the computer is programmed for the specific cam compression and timing and everything else that goes with the stock motor. I might be wrong on this not an expert. You can tune the computer for the differences either yourself or take it to someone who knows how

But if you ask me for my two cents drop that 350 in and put a fitech or sniper EFI on it, they are self learning so less problems , also the entire stock engine wiring harness can be removed from the engine bay, the body wiring, brake lights etc.. are a separate harness. Plus you can upgrade your engine and it will self tune to the mods so you can make more power when you feel like throwing more money into the engine
But I'm in no way an expert, others I'm sure will chime in.

 

Thank you that's more of what I wanted, I was thinking about using Sniper EFI because it seems like the best option for me right now.

 

I have a sniper EFI on my car it's really easy to do and I love it,, do some good research on the EFI system some of them have different feature plus different price points.

​​​​​​IF you need help just post pictures the community is great

 

Using the stock harness and PCM will require a tune to run properly because you are adding 45 more CI's, and a motor with different timing specs and compression ratio like theurge was saying. Even a (stock) MAF-based computer will have a hard time adjusting from 305 to 350 CI along with cam timing conflict. You can use the stock harness and pcm but it will either not run right, or you'll need to get it tuned or tune it yourself.
So, the Sniper EFI system will definitely be the most efficient turn-key option for your swap. The Holley interface is simple so you can fine tune after the unit "self-tunes" if you'd like. When it comes to self-tuning I've heard both stories: that they can't tune themselves worth a darn (with any power adding modification), or they tune themselves to a tee and the motor runs perfectly. Personally, I think the units do a great job of making a base-tune to run the motor efficiently to get it running and driving, but when you throw power adders into the mix, if you want to achieve the full potential of the motor a proper "fine tune" on a dyno will do wonders. Either way will work, mostly depends on which way you want to go. Like theurge was saying, there will likely be less headache if you go with the Sniper efi, especially when it comes to the wire harness.