[todayican]

Plain ole cheap Chineese 10hp like this one:
NEW 10HP Diesel Engine Electric Start Side Shaft 10 HP - eBay (item 180589918743 end time Jan-18-11 13:35:21 PST)

and a turbo like this one:
GT15 GT1544 Motorcycle Quad Turbocharger Bike Turbo - eBay (item 220709987668 end time Jan-06-11 23:05:38 PST)

Ill not use an intercooler but possibly go with a finned manifold pipe to cool the charge some, and like 3 to 4.5 lb of boost.