If it's truly spotted gar you're after, then zugbug's advice is the way to go. But I've got to disagree with him if you're after longnose. I've caught many, many longnose gar, both on fly rods and traditional tackle, and the rope fly is, hands down, the way to go. You'll go from landing 10% (tops) of the fish you get to strike with a hook to well over 50% with a rope fly (if you do it right).