Art,
<<I have spent hours on the web in search of air inlet
designs and have found nothing that was useful.

Does anyone know where I can find this information?>>

NASA report CR 3405 "An Experimental Investigation of Aerodynamics and Cooling of a Horizontally-Opposed  Air Cooled Aircraft Engine Installation"  has a section devoted to inlets.
Have you tried searching the NASA database?
http://ntrs.nasa.gov/index.cgi?method=advanced

Chris Zavatson
N91CZ
360std.