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2 bolts are fine, but if you find a 4 bolt it will be cheap insurance. 4 bolt blocks are rare for the 429 series, the SCJ's being the only production version. FoMoCo has an iron 4 bolt now in the marine catalog (same one in the hi-perf catalog too, I think).
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"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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