Convert to HEI

[joescott]

Hello all. I have a 1987 gmc suburban with 350 tbi. I bought it with a bad rod knock, so I only ran it for a moment when I got it.
After rebuilding the motor, I am getting code 43's and the truck starts running poorly. I have replaced the ESC as well as the knock sensor and the main computer.

My question is this. Can I go to the junkyard, buy an HEI distributor and run a wire to it and bypass computer control of the timing? I know the service engine
soon light will come on, but will this effect anything else?

Thanks in advance
Joe