Curious how to determine if I have the correct breaker cam in my NS2 on my 37ci motor.   Here's why I ask, my motor will start with fully advanced timing, but it is only running on the front cylinder at that point.  When I retard the timing all the way it begins to run on both cylinders, rather poorly but both are firing.  When I pulled the rear head and measured where the piston is (fully advanced) when the points open I find the points don't open until .1697 BTDC, so a little late.

(trying to avoid opening the cam case to adjust the timing gear!)