When I got my HEI setup from Tom Langdon, his recommendation was AC R44SX's, and I believe I have mine gapped at .060. The "X" suffix was for extended gap, which is necessary for HEI.
-Tim '51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's
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