I stumbled across a 1976 Huffy road bike with 3-speed on craigslist. I bought it for $35, mainly because it had a Bike Bug engine strapped onto the front of it. Parts have been ordered from Mike. I replaced a broken spoke, brake pads and cables and greased the bottom bracket. I thought about trashing the bike and moving the engine to a mountain bike. However I've grown attached to "BB HUFFY", so I'll do my best to revive her.
I MIGHT strap on a 2.8hp engine to the rear wheel. It's a Tanaka 47R, a very powerful cousin of the Bike Bug engine.