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Message: <blockquote data-quote="jonboylaw" data-source="post: 493696" data-attributes="member: 17621">Mark, my instal is for a megajolt and that uses the manifold vac signal, not a ported vac signal as used by the dizzy. In the picture you show for a DRLA, it is labeled the Vac Advance Port. Usually you will only have 1 per pair so back to square 1. If you tap the manifolds the signal will be wrong as the dizzy needs zero vac on closed throttle, pulling quickly to high vac just off closed throttle, then dropping back as it goes towards full throttle. It should work fine as it is for a dizzy so suggest you look at the idle /main cross over, what idle and main jets are you using?I run 60/130 in my 1955.Sent from my GX64 SatCom phone using Tapatalk</blockquote>