Starting motor on stand wiring help

Its an original 65 slant six valiant I have built the 340 for, few years ago I did the GM ingnition and GM coil conversion on the /6 and had been running it with that for the last few years. Recently I had tried to hook up the 340 the same way but could not get spark. Ended up using just the ingnition unit and a resisted accel coil, wired it up like the above diagram and got spark, may try to break it in tomorrow weather permitting, thanks all for the info