OK, let me first say, I highly recommend installing the OS 1.60 or whatever they recommend. After hours of head scratching and modifying, the gas motor is installed! Whoever said the carb intake venturi will stick out the side was correct. After butchering the bottom of the cowling for the plug, muffler and carb, it is now time to order another cowling (someday). Either way, I always do it, I find the most difficult ways to build my airplanes! I can turn a Firebird Extreme into a major project, am I the only one here?