A thought, for the test to work the circuit for the points has to open or closed meaning both sets of points need to be open to collapse the field in the coil so if one isn't working correctly it wont work. A search for dual point ignition is needed for a better circuit explanation. I did look at Summit hot rod parts as I have a catalogue and a complete HEI distributor is like 170.00 and a Pertronix point replacement set is 70.00 so it's not all that expensive to resolve. I would probably go for the HEI as it has a coil and the whole system built into it. Summit, Jegs, Speedway are all good sources for parts.