Mate I used to spear there a couple of times years ago, but unsure if you still can. I think so, but maybe someone in the know will be better to ask. The vis should be ok, but not amazing, so I reckon any gun between a 90 and 110 would suffice. Floats, 11 litre would be sufficient, too. I don't think there'd be too many monsters/speedsters that'd warrant a bigger float than that.
Cuzza