Ah, yes. Curselax. Amnesia isn't really needed here; your special bulk will already be good enough. Furthermore, the two attacking moves you've chosen don't offer the best coverage. You should probably go with:
Snorlax (M) @ Leftovers
Trait: Thick Fat
EVs: 188 HP / 104 Def / 216 SpD
- Body Slam
- Crunch / Earthquake
The EV spread is from Smogon, and beefs up his HP & defenses. Curse is obviously for boosting his attack. Body Slam is the preferred STAB move for the nifty chance of paralysis. The choice between Crunch and Earthquake depends on who troubles you more, Ghost types or Rock and Steel types. Rest is recovery and heals his status, and with a few boosts he can easily survive the sleep turns. Alternatively, you could use both Crunch and Earthquake in the last two slots - you will have better coverage, but lack of reliable recovery hinders him a bit.