Charlie.. have you tried to interface the new timer board with another brand of ignition yet?
I found that there is something loading the optocoupler chip and it's not sending a full signal to triger the SCR on my other ignitions I make here.. maybe the coupling capacitor and resistor.. not sure.. it might just be a resistance value too high on my boards..
I used a 180 ohm on mine and the new timer board /CDI value is 150 ohms.. I can't trigger the new CDI either by just plugging in a hall effect to the proper parts of the circuit..I'll have to change a few values to try it I guess..

My design board schematic I made uses a 680 ohm before c3 and a 200 ohm after it for the coupling of the hall effect to the SCR gate..maybe I have to reverse those values since the optocoupler is using a phototransistor output..

Any ideas?