If there is antifreeze in the oil pan, a crack is internal, and probably very hard to repair, and there may be several cracks. I think the 440 is probably yard art, or a boat anchor.

Just for kicks, with the drain plug out, pour a little water into the radiator, and see how long it takes the water to run out of the drain plug. I had a block so bad once the water ran out of the drain plug in the oil pan almost as fast as you could pour it into the radiator. That was entertaining for a few minutes. Gene