Why would you want to put 6.5 quarts in a motor that takes 5? Do you have a non-stock oil pan? Did you remember to pour some in the oil filter before screwing it in?HOw much oil do I need for this thing? 1970 351C... I just did an oil change and added 5 quarts to be safe, plus a pint of SeaFoam. Should I adda nother quart or half quart?