What rpm stall converter should use?

PG Duster said

Will heat be a problem, I have a 11 3/4” by 9 1/2 trans cooler on the car. Mounted in front of the radiator.

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Nope, not as long as you specify you want a tight converter. Even with a loose converter, you won't have a heat issue with a good cooler like you have. But you want a tight one for the street.