Like PX said Snorlax is very slow, scarf is useless.
If you want a Choice item go with Choice band. But I would go with CurseLax I give you two movesets one Choice Band set and one CurseLax set
Banded Snorlax (Snorlax) @ Choice Band
Trait: Thick Fat
EVs 252 Atk / 4 Hp / 252 SDef
CurseLax (Snorlax) @ Leftovers
Trait: Thick fat
EVs 208 HP / 124 Atk / 176 SDef