I'm looking at a Cat 30. The owner says it is between 76 and 79. It has a much wider bulkier keel than the others I've looked at. It gets wider at the bottom. It is also flat on the bottom. It draws 5'2". Does any one know what year and model this would be. Also it has an atomic-4, is this something I should be wary of? And is there anything I should inspect before making a decision other than the basics?