I just picked up my custom radiator and it looks great. I had them make it out of a stock T1 L body radiator. It is shortened by 1 1/2 inches, they removed the tranny cooler, put a threaded heater bypass that can be plugged, and used a truck core that cools as well as a 5 row core. The only downside is that it is heavy. It cost $445 out the door but at least I know it will do the job.
I had it done by Empire Radiator.
http://www.empireradiator.com/