Wow! you guys have really impressed me with your knowledge. I will be getting an HEI distributor with vacuum advance shortly and try that. If no improvement I'll remove hood sides and try that. The electric fan I am currently running does not have a shroud and I have about 1/2 inch clearance from the front of the water pump to fan. I know if I had built the car originally things would be a lot different but I'm trying to make do with what I have.
Thanks to everyone for your ideas and comments. I will let you know how it works out.