There is one bolt on the snout that you can not get to while it is on the car.
Take the whole supercharger with plenum off as one piece, it will make life easier. While you are at it, now would be a good time for valve cover gaskets. Also, if you have the blower off, you could replace the needle bearing on it at the same time. I let mine go for 207,000 miles before I broke down and did it. First time any bolt on the engine had been cracked. What a hassle! Anyway, all the bearings were shot. Blower still was putting out 12lbs of boost...these eatons are built tough.