I've never used any particular program for mass...we always trained to gain muscle, and kept a 85% clean diet. I've never believed that gaining 50 lbs. of fat was a benefit in the long run...just more dieting, and more fat to lose.
I try and stay reletively lean in the off season, I increase my protein intake and meals per day as I get closer to the show, and decrease carbs according to where my physique is at...