Thank you very much, I’ve been completely stumped, and yes it sounded really healthy and since I swapped it from carb to tbi it sounds terrible, I ran the timing light on it and it would bounce all over the place then get consistent. Would it be cheaper/easier to get a carb intake and a carb and go from there?
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Well, you have to unplug the advance bypass wire on the firewall when you check the timing otherwise it’ll be all over the place like that. To someone who knows TBI, it’s not a big deal, maybe a half a day job, and if you can find a 1987-91 TBI vehicle with a 350 being parted out, probably not expensive either.
But yeah, then you still have the cam issue. A carb setup will play nicely with a lopier cam, but you’ll still have unreliable or inoperative vac accessories, namely cruise control, brake booster, and emissions devices if that’s important to you, and you’ll need to figure out how you’re gonna get the fuel pressure down to make it work with carb, either going to a mechanical pump and deleting the tank pumps or regulating the electric fuel pump down to half or a little less than half of the pressure it has now and supplying fuel pump relay pin D with independent voltage since the ECM’s gone.
I don’t know what the actual cam specs are so it’s hard to definitely say that it will or won’t work, but if it’s me, I make the TBI work with some different electrical components instead of rocking the boat even more, and if I have to put a more appropriate cam and lifter set in to finish the job right, so be it. I prefer not to make radical changes to engine control components if it can be avoided.
Others will say go the other route, and they have good reasons to say that, but at the end of the day, you have to make the executive decision.
