Not sure if what I have is a "Ready Rad" but it came from Advance, bolted right in, looks stock for a flat tank radiator, no stampings at all on the top tank. This one is in a car that was only run an eighth at a time, with no problems overheating unless I forgot to turn on the fan and/or waterpump .

Had one in my prior b-body too, street driven, and it stayed nice and cool using a Mopar clutch fan.