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My reason for asking was in some cases (like mine) too much compression will cause run-on. Nothing you can do about it aside from running 98 octane or big addatives. (or lowering the C/R).
You have two problems. Running rich isn't causing your run on. That is caused by too much air / fuel at shut off. You need to get the butterflies closed to reduce this. Often in the case of big cams or long duration cams in order to keep them idling you inadvertantly open the primaries too far. I'd suggest verifying the static timing, advance it if you can enough to keep the idle at 800 while closing the idle adjustment screw.
Try that. If it doesn't work we'll try something else. Never, never attempt multiple fixes on a carb enless you know what the result will be. It only makes things worse in most cases.
That said the next step would be removing the carb and closing the secondary butterflies slightly to essentially do what we just did on the primary side.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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