Slade,
I will measure it tonight for you when I get home. I can tell you though that my front air cleaner rubs on teh underside ribbing of the hood. So there is not very much clearance at all.
I have 3 of these rubber K&N look-a-like thingies so it does not do any damage, but if was using somethign harder in material (like the oval air cleaner you are thinking of using) it would be aproblem.
You want me to measuer from the top of the offy amnifold to the hood also?
Bill