It's pretty easy to install the dist gear teeth into the cam gear so that the dist cannot be moved enough to set the timing right.
Of course the timing gears can't skip a cog, I was thinking of timing chains. Obviously these old guys have gears or at least the last one I overhauled did.
'31 Chevy 1 1/2 ton, '42 GMC 2 1/2 ton 6x4, '52 GMC 2 1/2 ton 6x6, '53 GMC 5 ton
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