Re: recommended line weight.
While I agree with Cliff in principle, the additional weight to the fly would ruin my big northern flies. I throw 10 inch flies with a nine foot leader on an eight weight Temple forks with a nine weight pike taper. I would recommend the pike taper over all others for big stuff IMHO. I can push it 60-70 feet on most days with minimal wind.
You will need to adjust your casting throw. It is critical to not start your forward cast until the back cast has straightened out. As Cliff said the fly is very big and will kill your line speed. This type of fishing is a double haul must and cannot be over emphasized. Even being used to fishing this style almost exclusively I still end of with piles on my head when I blow the timing.