Like someone else said none of these engines will fit inside the cowl without cutouts.Personally I would go with the zdz 120.I have one in a hanger 9 cap 97 inch ws.More power for your money and I also have a 60 zdz.Great engines.I have a friend who purchased a d&a 100 and is having problems with it shutting down in flight.Recently has caused him to damage a35% edge.I am sure he will get it running ok but he likes my zdz.