Just caught a Snorlax...
Answers
I would definately max this one out if you don't have any other good candidates to spend your candies on. He has relatively high IVs in the two stats where Snorlax is weakest (atk, def) and low IVs in stamina which won't make a huge difference with 320 base stamina.
ZH/HB is the second best defensive moveset for Snorlax, and since he's already such high level, I'd at least power him up to lvl 30. It depends a lot on your local gym situation if you need to power him up past that, but IMO at lvl 31 when it costs 6 candies for ~23 cp, I'd start saving the candy for a second Snorlax.
Your Snorlax is very similar to my first and only Snorlax. Same moves and almost same ivs(66%). I never powered him up cause of low ivs. Also I don't power up defenders and Snorlax is very slow and boring attacker. maybe I'll power him up eventually. Hopefully u will be able to make a decision suiting to it needs.
I have 2350cp 6.14.13 snorlax ZH/BS Ive been sitting on for over a month. Even though I have 65 candies and 40 untransferred Snorlax Im holding off on powering it up. The reason why i'm hesitant is because the atk stat is so low. Im afraid that IF i play this game in 6 months this Snorlax will wind up sitting below hi IV Rhyhorns and Gyarados in gyms. Plus Ive been collecting on 10+ gyms for months. I feel like Snorlax being so close in max CP to Rhyhorns, Gyra and vapes makes it highly reliant on IV for gym placement and effectiveness. This mon at 5-7 spot is basically a death sentence for a level 10 gym.
Before Androgynous yells at me for circle jerking IV's I want to say this. I dont think Dragonite IV's are as important as a 0 iv dragonite, its still larger then any other 100% mon. With your top 12-15 gym defenders other then dragonite IV's are critical. With Dragonite I think high starting CP is very important. That being said if your a freemium player and you feel you wont get another one thats better, power it up. Cash players and players with access to resources like feeds, like myself, can be picker then players who dont. That being said Im also competing against next level spoofers here in Los Angeles and its very hard to compete against players like this.