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I am having to use a advance timing light and when I try to retard the timing to line up the marks it dies. To get the marks to line up it is at a ridiculously advanced initial timing.
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I am curious how you are using your timing light. Does the statement above mean you are setting the dial to 10 and moving your distributor to line up the mark to the tab?
And you set the timing to get the engine to run and check the timing by turning the dial it's extremely high?
And it idles at 800 rpm?
It a "crate" engine but who is it from? GM or just a rebuilder?
I'd put a vacuum gauge on it, set the base timing to get 18-20 of vacuum and then check to see home much timing it takes. Maybe the camshaft is mis-timed or perhaps you have a vacuum leak. Bad carb?