You probably won't even need a fish finder rig b/c you probably don't need the weight. If you do, the fish finder rig modified is perfect. I would use 60# wire leader with the 18" fish finder rig made of at least #80 mono or fluro. If you don't need the fishfinder, go with 12-18" 80# mono or fluro directly to a hook. You will probably need a stinger hook on wire line also, otherwise there is a good chance the blues will just cut the back half of the snapper off and leave you with half a fish. If you want to get more time out of your livelined snapper, you can use 80# mono or fluro to the stinger hook and rubberband it to the tail of the snapper or bait. That way you aren't hooking into the bait twice. 5/0 or 6/0 hooks are good too. My teasers are only 5/0 hooks and they were plenty big enough for blues in the surf.
Good Luck. Hope I didn't confuse you
