Two engines?? All things are possible and unless you want to spend ALOT of time (ALOT OF TIME) I would rather do somthing els. If you instead tried to put a .70 or a .90 in the Genesis this would be a more simple project compared to trying to put two engines into this sassy chassis. My question would be about gearing and RPM's of the engine you may install in the Genesis if it was a larger displacement engine. I would also worry about the parts (driveline) of the Genesis handling the torque of the larger engine too. Remember, the Genesis engine is already 5Hp and more torque than you can shake a stick at! LOL
If you do it,, tell us about it!!! Peace "O"