92 chevy pickup with 383 (timing & fuel ?s)

Our TBI -383- has a Holly fuel pump BUT stock fuel pressure regulator. Do we need to change the regulator for more pressure or should the stock one work? Also, what is the best timing for this motor? We CAN NOT seem to keep it from backfiring through the throttle body. (Stock computer, stock TBI, stock fuel reg. BIG! CAM!)
Please help, we are stumpped!!!

[quote]BIG! CAM!)<hr></blockquote>

Is this a speed density system? Is the Holley pump in the tank or on the frame rail? I am not sure about the '92, but an '89 TBI only requires from 12 to 15 lbs. fuel pressure. What does the Holley put out?

Oh God! my advice to you is ditch the stock components, they were never designed to handle a big cam. I've tried this so many times now that I just say forget the heartache and get a carb and intake, trying to figure out what the factory ECM is doing and solving each little problem is a never ending process. Once you get it working well the outside temp changes and your back to square one. Injector sizes, mapping or density changes make this a never ending project and you may never be satisfied with your results. Sure the magazines tell you to do it but in reality the real results are less than spectacular.

How many grey hairs on your head now?

Fogetaboutit! <img src="graemlins/crash.gif" border="0" alt="[crash]" />

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Outlawed tunes from outlawed pipes