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The radiator is new but I think there is rust in the heater core.That does not look good........
Flush both ways, I have had good luck either removing the lines from the heater core and adding water hose connections to them then switch the water back and forth and dumping into a bucket to see what you get out. The rust could be from the block not the core. Yes would highly recommend antifreeze and not water...LOL
New 40?Might be in on that, could be good chance to see what the “new” 40 will do