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As far as I know B18 and B20 radiators are interchangable. The best test for condition unknown radiator is to install it and the let the motor IDLE while monitoring for leaks and watching the heat guage. If it's seem WNL then take for a short, low RPM ride. If that goes OK, then take it on the freeway, monitoring the guage always, esp. after coming off the freeway.
I have an electric fan in my Amazon w/B18 and I hardly ever (maybe exiting freeway on a very hot day and then sitting in trafic) have to turn it on, so the radiators and water pumps for these beasts are pretty efficient.
As far as servicing the radiator, I'd leave it to the experts. Better to put money into the broken radiator now than a melted motor later.
Good luck.
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