All of my previous boards were made without timer boards.. I used the CH Synchro Spark on most of mine for auto advance and also work extremely well. I think I bought one of Terry Grant's first batch of production boards and they are all still working! That says alot for design and attention paid to detail.

I have a PCB file and schematics for my CDI's I make here. Although the parts placement has changed over the years due to different sized boards, all components I use are the same. As for the Spark coil, I also bought some from CH electronics which are so small and light weight, it's hard to believe the spark that you can achieve from them. It's in a black plastic potted form about 1 inch square. Can be seen in one of the photos on the motor. Still looking for the original source of those however.. also pilfered the seperate coil from a McCollough 28 cc weed whacker magneto..also worked well. Zenoah coils work well too. If anyone has a source of coils I'd be interested in looking at them on the website. Found a few for around $20 which work..S&S machine also sells one already wound and ready to wire up. In fact, I believe it is what's inside the square one I use.
The Hall Effects I use are Allegro part# A1104LUA available for around 79 cents each I think, from Jameco.
Honeywell SS443A are ok to use also.