I run 13.5:1 comp on the street, with a 700 HP motor and it never gets above 180F! Most of the time it hovers around 160F.
The things I found that worked on my car in order of importance:
1. Ditch the copper/brass radiator and get a good 2 core Aluminum. This may drop the temp by 20 deg alone. It did on my car and I had a custom 5 core high efficiency radiator that was "gauranteed" to keep this thing cool.
2. High flow water pump over a stock. And or/ impeller mod thats been discussed here.
3. Speed up w/ a pulley change (you did that).
4. Cooling line(s) to back of the heads from the water cross over.
5. Use water only in the summer with a corrosion additive. Do not forget in the fall!
6. Make sure its timed right.
7. Lastly, verify the temp with a digital probe to make sure your gauge is correct!
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Tempest455
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