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MFI? Do as Kevin says and get a standalone Lambda sensor (or better yet, 2) and a knock retard system. Then religiously observe the lambda and "adjust" the MFI as necessary. 25 degrees is a good place to start, 23 might be better. Leaving a tiny bit of hp on the table is better than torching a cylinder. And if you're too "busy" when driving, set up a camera to watch the lambdas under load. Too lean and too much advance will quickly destroy any engine. Oh, and what kind of fuel did you have in it? 12:1 is race gas only territory.
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