I've ran into several Cobras with miss marked dipstick. Fine out what size
oil pan you have, let say 5 qts. Drain you
oil and then add 5 qts, check the dipstick to see if the
oil comes to the full mark. If not remark dipstick. Most Cobras have remote oil filters. Add what oil you can to the filter and then install it. Crank the motor and let it run for a few minutes. Shut the motor down and give it a couple of minutes to let most of the oil drain back into the pan. Then check the dipstick and add oil till it is to the full mark.
Some oil pan are listed as 5 qts but they include the oil in the filter, some manufactures list with out the filter. I find this to be about a 1/2 to 3/4 qt differences. In a street car not a big thing.
Dwight