Power up this Snorlax?
Answers
I think everyone is too far down on HB as a Snorlax charge move because it is so bad for Dragonite. But Snorlax benefits from STAB with HB, and also since Snorlax is much tankier, he will deploy HB more times than Dragonite during a battle. Even if you dodge HB (which you should), it still stings.
IMO hyber beam is the best currently available.
To answer the original question...
You have a ton of Snorlax candy (and this is your best?) so candy isn't a problem. But you are pretty low on stardust and this would eat up most of it.
I would probably wait if you can. If you get lucky and hatch a Lax, he will be much higher level than this one. And once you know more about gym rework, you may not want to power up this Snorlax given that it will take most of your stardust.
Seriously though...how do you have over 200 candy, and this is "by far" your best Snorlax?