Cheap EFI for steady, or near steady state engines. (Read: Airplanes)

http://www.rotaryeng.net/simple-cheap-555.html

Something else to think about.  EFI is a beautiful thing.  And that page suggests a method to keep an engine running if the EFI dies.  I like it.  I think it would be better than trying to run some sort of ghetto rigged carb, and would provide individual cylinder leaning.

Mmmm fuel economy, and power.