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with afr heads an air gap and a old style block do i have to run a bypass hose from the intake to the water pump or can i just block them off? I have blocked them off but temp seems to be up about 20 degrees,,,
 

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If the engine still has the factory type water pump, then there should be no need for any type of bypass. The extra hole on the one side of the pump flange is the bypass.
 

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Many after market performance water pumps don't have the by-pass port or have it plugged. So, to be safe, drill a couple of .125 holes in the flange of your thermostat. This will help the water circulation in the crucial areas of your heads while the thermostat is closed.
 
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