Planning on doing the same thing to a '89 with a five speed. I send a request to FITech technical support and got the following answer
Hi
you're on the right path, I did this with my father's 91 Caprice wagon.
You want to use the go Street 400 and piggyback it over your existing
system. So yes keep your factory distributor including all your factory
input sensors like air temp, and you will have to share the TPS signal
between the factory computer and the FiTech throttle body. But you'll
find a set up works extremely well. You won't even get a check engine
light on the stock computer. Anything else let us know
-------- Original Message --------
Subject: Tech Support Request
Date: 2018-06-30 07:43
From: FiTech Fuel Injection <
[email protected]>
To:
[email protected]
[1]
Vehicle Make:
Chevrolet
Model:
C1500
Year:
1989
Which FiTech product do you need support with?:
30003
How can we help you?:
looking to install the 400 hp Easy EFI system on my truck. It has stock
TBI unit in place now. Was going to purchase an Edelbrock 2104 (or
Summit Racing equivalent) manifold. Going to use a Walbro in tank pump
system like this
https://www.ebay.com/itm/Genuine-Walbro-255-LPH-High-Pressure-In-Tank-Electric-Fuel-Pump-Filter-GSS342/181584266377?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649
[2]
Hopefully this all works Last question is ignition. Can I run the stock
Distributor and computer to control ignition or do I need a one wire
hookup non-computer dizzy?
Thanks
Tracy