i have a 89 firebird with the 305 i have ultimate tbi mods ported 081 heads 1.6 rockers lt4 springs an lt1 cam and a tpi fuel pump with hooker headers cat delete and mag. cat back, my only question is will the stock fpr, made adjustable, alow enough fuel in for my motor? the last thing i want is for it to run lean and fry so im just wondering

 

Without reprogramming a chip, I would think if anything you're going to run extremely rich, if you run at all. I did alot of the same to a 1990 LO3 and it was overkill for the stock chip, and when I finally got a chip programmed for it the best I got was way rich, as the chip was sensing all this new air flow and all it knew to do was dump loads of fuel in on top of it - I never saw any performance gains since I couldn't get any further on the chip. Next time around I gave up and went carb! But I understand there are better chip programming techniques available now thaen there was back then.

AND - I'm no expert - so wait to see what others have to say. I just know that when I went that far, it was too far for a stock chip.

 

Yes, install an adjustable FPR it is one of the mods that needs to be done.