I made my own crank trigger using a Chevy wheel modified to fit and cutting down my tach drive Mallory to put the cap right down on the base.
It's an amazing difference, i'd always had lots of ignition issues and the distributor moving all over. There's no need for a timing light since it can't move and I never change it. It's easy to phase the distributor my eyeing it.
Now the thing has 38 degrees all the time, still cranks and fires easy with no retard (other than the driver!)
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