/ Radiator #2  
I tried to do a search but, nothing came up for coolant capacity. I would guess the radiator alone would hold somewhere around 4 to 5 quarts.
   / Radiator #3  
People usually ask about the cooling system as a whole, not just the radiator. If you have sixteen quarts of coolant on hand you should be good. If you don't need quite that much, it never hurts to have a little extra. If that's not quite enough it will get you running until you get more.