The lady's fuse was modified to accept the larger gas engine.

  The reinforcement on the left side of the firewall was ground off to make room for the engine mounted 1/4" left of center to compensate for torque.  
     The engine's rear housing was designed to be mounted flush.  4 mounting holes and the fuel access hole were drilled through the firewall and fuel proofed using a thinned down epoxy mixture and applied with a soldering acid brush.