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One step at a time...
Get your waterpump dialed-in, then see how things are.
My new radiator is the "heavy-duty" 10-fin/inch Brassworks, and I've had no issues with the waterpump pushing water out the overflow.
I'm very pleased with my set-up; my car is a driver (not a show-car), and gets driven quite a bit... through some pretty hot days recently... it's been behaving.
This forum is a God-send !