Yes I have drilled the # eights to use on a gas before when I needed a different advance and also a good rotor shaft or also a housing with serviceable bushing. That way you can make the hole to the max advanced wanted. Placement of the hole is critical on placing the weights on the right swing arc to the cam. Will also change the advance rate from original with little changes.
Think I didn't say the first letter on the base can ID the original advance and intended use. May not be what's found now though. First letter was called the distributor symbol.
Interestingly the list I have that id's a N symbol gasoline says its a CW distributor. Doesn't specify the direction viewing from.
400,450 parts book doesn't specify the rotation direction. Older parts books for like A or C say CCW for a distributor turning the same direction as a 400 gas.
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