Show us some odd ignitions from the past

MARK TEN B..on my Mazda! i dont think it works as the switch IN/OUT doesnt seem to do anything but when its CD OUT, voltage to the coil is like 5v and when its CD IN it reads 12....not ~ 300 i was expecting. i can hear the high frequency switching of the transistors maybe the big storage cap is bad.
You won't see 300 volts across the coil on a multimeter... the 1.5 uF cap is charged to several hundred volts and "dumped" into the coil when the SCR fires. That pulse is very short and a meter can't respond to it. Now an oscilloscope will tell a different story.
Also, if your existing points/coil ignition is doing its job, there shouldn't be any dramatic difference at idle...