When in doubt, always go for pussy. Oh, you werent talking about that?
Well, at 6'0 and 160 there is no need to worry about too many extra calories. Read Massive eating and all its parts/versions by John Berardi.
You said you made a 5lb gain, which is good. More or less, you'll make progress on any program with a surplus of calories. In your case, a big surplus.
...that, and we're just glad you didnt ask about a 6 pack.