I am trying to determine the correct oil capacity for my '70 428SCJ Mustang. The 1970 Owner's manual says: "302, 351, 428 = 5 quarts". Below this, the owner's manual goes on to say: "429 Boss, 428 = 7 quarts". Below this information the owner's manual states "add one quart for oil cooler". From this information, it could be anywhere between 5 and 8 quarts of oil for a 428SCJ. Does anyone know the correct oil capacity for a 428SCJ? I have put a total of 5 quarts in the car (it does have the external oil cooler) and it shows slightly over full on the factory correct dipstick. Any information would be greatly appreciated.