If you have hight “problems” skip the under- and above-plenum thinking!
Make horizontal tangential feed into a cylindrical plenum!
Acheive swirl mixing with any fuel mix!
Take them all in tangentially horizontally!
There are horizontal carburettors for gasoline, single and doble throat.
Use a single or double throat for gasoline and a double throat for air-woodgas mixing.
For woodgas mixing Chris used a Ford F-150 twin horizontal throat carburettor… 50/50 mix on a golden plate!
Hopefully, you have already read that the 50/50 mix is the best to ignite…
Go horizontal and you have all the room and swirl mixing!
If your ignition system is “failproof” keep it!
If it gives 1" or better sparks, that’s enough!
Advancing ignition with a mechanical distributor is easy, but if it is made by a computer, a thorough investigation of the type and its character has to be taken…