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Offset dowels are needed in about a third of all scattershield installs (in my experience), reguardless of whose scattershield you use. They have even been necessary on factory cast aluminum bellhousings too. You are correcting the relationship between an engine block which has most likely been machined since the factory, and the scattershield. Your scattershield may fit somebody else's 427 and need no correction at all.
All scattershield manufacturers tell you to check and if necessary, correct alignment to the crank centerline.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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