Eric -

True, there are two spots on the cam where the point open. Unless there's some big problems, the point gap should be the same at both spots. If the cam nose is bent or the cam lobes are worn, you can get different readings which will show as a double image in the timing window when using a timing light...this is "differential timing". But generally, this is not so much of a problem. Differential timing can be solved a number of ways, one of which is to install an electronic ignition system such as the Dyna III, Boyer, or even use a crank-triggered ignition system which fires once a crank rotation, not twice like the cam-mounted systems.