+1!
AND, 190F thermostats are the new "standard rate" because it helps get the O2 sensors on later model cars up to operating temp sooner, allowing the engine management to engauge sooner (closed loop).
The thermostat's only job is to get the engine up to operating temp. After that it is all up to the radiator and fans. After it opens fully (212F for a D), it just sits there...so there is nothing to be gained here.
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The 4 pumps:
I think you would have to test the 4 pumps to know which one has the highest flow. Look at the impeller fins closely. They have different shapes and total areas.
The pumps are more than adequate. E.G., The factories often use the same pump for 4-8 cylinder engines and on newer higher horse power engines as they come along.....
It is not true that you can have too much flow WRT heat transfer! (Hard to out run infrared, J/K;-)
More flow is good, but and there is a down side to increasing the flow after reaching an adequate rate. More flow means more horse power, which means more heat. Racers found this out years ago...all this is somewhere on the Edelbrock sites.
FWIW, I agree with a better radiator/fans as being the way to go, imho.
EDIT: TYPO 112F->212F