[1795]

I am thinking that Tony may have hit the nail on the head. There are very few reasons that I can come up with that would explain running 2500 rpms or less at 210F and going to 3000 or above jumping up to 250F. Mine was running hotter than normal (220F) at Pitt Race and I upped the jetting by a size on the Webers and the temp dropped back to 210F. You might want to try some slightly richer main jets and see what happens.

You might also want to see what your timing is set at. Under 2500 rpms you are more than likely not at full advance, which will usually kick in depending on the distributor around 3000-3500 rpms. Too much advance could lead to overheating as well.