Propane-only fuel

[Dauntless]

Anybody have experience with a propane-only tubrocharged (spark ignition) engine? I am thinking of switching over completely to propane, but wanted to hear some first-hand experience before doing so. What got me to thinking along these lines was this article: http://www.truckworld.com/4x4-OffRoad/96-1957TurboWillys/1957TurboWillys.html