Crab Distributor/timing

The short answer is you don't. Easiest way to setup the distributer is off the engine on the bench. Timing is controlled by how the points are set (gap). There is the provision on the distributer to make minor adjustments with the distributor installed. The timing on the early flatheads was somewhat foolproof and is controlled by a tang on the camshaft and a slot on the distributor.

Here is some information on crab distributers on Bubba's site: http://www.bubbasignition.com/crab-42-48.html

Here is a recent thread with some tips on setting the points/timing.
https://fordbarn.com/forum/showthread.php?t=253502
 
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