I have been investigating the Corvair engine as a possible alternative aircraft engine.  I even bought a conversion manual from William Wynne, "The Corvair Authority" http://www.flycorvair.com/.  This engine seems to fit the bill of being inexpensive, with readily available parts and components, reliable, powerful (100 hp) and light.  It is a direct drive engine (no gear or belt reduction drive) and has been used for decades in experimental aircraft.
I also think that the VW based alternative aircraft engines are good candidates, but have less power (about 80 hp) since they are 4 cylinder engines with smaller displacement.  The ones that I have looked are the AeroVee http://www.aeroconversions.com/ and the Great Plains VW based conversions http://www.greatplainsas.com/.
 
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