Is angled radiator less efficient?

My Cobra has a full sized radiator mounted at a 45 degree angle to clear the bodywork of the nose. I was interested to know if that decreases the airflow over the fins.
Anybody else out there have a clearance issue and have the same setup? Is there a low profile item out there that I havent seen?

It depends on the ductwork leading to it. A rad doesn't flow as much air as a hole the same size, so the grille can be much smaller than the rad. Look at WWII fighter aircraft to see what I mean, the Mustang in particular.