Lifting strakes are the same thing as the famous steps under the V-20. Hulls in the sixties didn't have them as the deep vee hull was just coming into the boat market at that time. Before that most hulls were pretty flat and din't need lifting strakes to get on plane as a flat hull planes easily by itself. Current hull development pivots around HUNT's famous deep vee design which spawned the variable dead rise hull of SEA CRAFT fame as well.