I kept my stock radiator, but had it cleaned, sealed, and painted.
However, I did switch to a SPAL 11" mid-profile fan that just fit under the lip of the end tanks using the included brackets and the stock mounting points. This allowed the fan to be close coupled to the rad for hopefully better airflow (plus it's 1" larger than stock, yet still draws about the same current) . I just switched connectors from the old fan to the new and plugged it right in to the circuit.
http://i2.photobucket.com/albums/y12/tj ... 300836.jpg
My engine is fairly stock (with the exception of the intake and ignition), but it's kept it cool for two summers so far, albeit, they've been kind of mild summers. I'm waiting for the next big heat wave to test it's performance. Now, if there were only hills in Michigan.