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How loud is.....

You will be OK if the guitarists aren't pushing tube stacks, and / or if the PA has enough juice to carry the bass. Inside a typical gym, the huge issue is the amount of echo, so unless everybody plays with restraint, it will just be a deafening mush.
 
The most common mistake is to "overplay". If you can do a soundcheck ahead of time, just try to get everyone to play down . Trust me, it will be loud enough , and "clean" sound will get you alot more compliments than "loud" will. If your bass is not comming thru at say 70% volume, then have everyone else turn down.
 
I play in a highschool gym (where my church meets) every weekend, and a 320 watt head (Gallien-Krueger 700RB-II) alone is able to stand up against a drummer, electric guitarist (with distortion), acoustic guitarist, pianist, and a few vocalists. So, with PA support, I'm pretty sure 350 watts will definitely hold up with the rest of the band.

As for the echo/reverb/muddiness that you will probably get when playing in a gym (unless yours is acoustically treated), lower the bass frequencies under 100 hertz. I had a terrible time working in gyms due to the bad acoustics, but after Norm Stockton gave me this tip, it made a world of difference. With these settings in a room where the bass frequencies are bounced back and forth (causing muddiness), you can turn up louder without your bass sounding just like low, annoying noise. Thus, you sound a lot better than when playing in a gym using "normal" settings.
 
1. DON'T use incomplete subject lines, just ask the whole question.

2. There's no answer to your question without knowing the efficiency of the cabinet being used with it. 100 watts with an efficient cabinet is louder than 350 watts with a less efficient cabinet.