Yes, the 630 is a 162 chassis saw. It's more or less a continuation of the 162 itself, it uses the same 48mm bore, closed port cylinder.
I know the 266 cylinder will fit under the filter cover, not sure about the 268, but I believe you will have plug clearance issues with a 272 cylinder.
Unless it's a very late Super, it most likely is a dual coil saw.