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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
You still need a thermostat. The electric water pump doesnt turn off and on when the engine warms up or cools down. As I understand it, the electric pump runs the same as a belt driven pump... it just doesnt take power away from the engine. Are you running your car at the track or what is the reason for an electric pump?