Thermostats - high flow vs standard flow - now I am confused

The answer is yes, a high flow thermostat should be used with a high flow water pump. An Edelbrock performance water pump puts out 20% more flow than an OEM pump and an equivalent amount of pressure. Do not confuse flow with pressure. Flow and pressure promote better cooling. Cooling is a function of the difference in temperature between the coolant and its heat sink. Picking up heat from the engine follows the same function. Flow is important because it creates eddy currents that mix the hot and cooler coolant in the engine cooling ports and the radiator tubes. Otherwise, the coolant stagnates at the center of the passages and does not mix with the hot coolant. Newer engines have very small passages to facilitate that process.
Take a look at this blog post from my website. UPGRADED PERFORMANCE RACING RADIATORS. Think about standing outside with a wet shirt on at say, 40 degrees. With no wind, you may feel cold but not as much as you do with even a slight breeze. What happened is that you released more heat with the air passing over your body like water would pass over the engine and through the radiator. This post may also be of help Racing and Performance Water Pumps.

Thanks
Jean Genibrel
Appliedspeed.com