AHA!!! DMMorris we do agree at last!!!
Increasing your initial timing can lower your operating temps. Experiment to see. Increase in 2 degree increments until you get 'ping' under a light to moderate load. Then back off two degrees.
And Yes, I discovered this when breaking in a cam in the past. I set the distibutor at a point where I knew the engine would start immediately. I then increased the RPM to about 2800 RPM and began to go over the engine looking for any leaks. After about ten minutes of run time I noticed the headers were glowing red at the junction of the individual pipes and the collector. The water temp was about 225. I almost panicked. Without lowering the RPM, I hooked up the timing light, dis-connected the vacuum hose and plugged it and set the timing to 36 degrees. It was about 22 degrees to start. Pipes immediately cooled down, water temp slowly went down to 185.