A 360 rad is usually defined as a 3x120 rad, but I can see where you get '360' from. When in doubt, simply stated as <number of spaces> x <fan size format>.
Yes, I believe you'd be fine with a rad like that, can you link to it for us?
Agreed, I'm going to throw in my old Rasa 120 today just to scope things out, I can post pictures if you like. Would the pump included be ok for a cpu and gpu loop with that rad I posted? It's rated at 450lph