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I want to switch to an electronic advance dizzy on the motor too.
I've been assuming you have something like a 4G SI distributor with 3 VR sensors, an ingitor, and a coil crammed inside. But you mention wanting to switch to electronic advance so, I assume you have a vaccum advance distributor.
Those have an external coil, no? Are you familiar with the VR sensors inside your distributor? Does is have a 4 spoke TDC VR sensor? That is key to signalling the MS when each piston is at TDC.