Rusty, Increase the radiator thickness to around 4"(this is why Tracy's
airplane works so well) and your cowling clearance problems will go away.
This
is what Nascar radiators are running for thickness, and believe me, as close

as all those cars run there's been some considerable testing on radiator
design.  Fred
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Fred, I originally wanted a thicker core, but nobody seems to sell them,
even in custom radiators.  Griffin has a 2 row core, that uses 1.25", but
that's the thickest I've been able to find.  So far, I've looked at Griffin,
Howe, and C&R.  Are there any other good sources for custom rads?  

Thanks,
Rusty