Just to add another voice yes you will float.
I am 175 and ride a 157 proto (similar profile to your gullwing) in 3ft of pow no problems at all as long as its pretty steep.
Yes of course if you can get your hands on a pow stick thats going to be better but you'll be sweet as you are.
Thanks! I have sometimes thought that I had to get a powder board - for the sole purpose of this trip, which isn't that cost effective. Perhaps if it comes tons of snow I'll rent a pure powder board in order to feel the difference and hopefully the fun of it.
-- Better to have tried and failed and not tried at all --