I wanted to advance the time more than the offset keys would allow. I think I advanced it 20-25 degrees above factory setting.
Below is a video showing the generator running from the truck gasifier.
I have used a small lawnmower motor running from wood gas and used a 4 cylinder dist for running retard or gasoline and switching to the advanced flywheel ignition on the fly.
Wish I had pictures but it was long ago before I had a camera .
The below thread talks a little about this .