I'm not sure the best temp to do it whole, we did discuss some in this
sous vide duck thread. The temp difference is because 176F is for duck confit, which is cooked at a much higher temp. In general, I do duck breast at 131F because I like it medium-rare, but I haven't done legs before so I'm not sure the ideal temperature.
I'm also not really sure about whether to gut it first or not. I would probably lean towards gutting it before cooking it but someone else might have a better idea than me.
Thanks!