It makes more sense to switch to an aftermarket MAF all together. Most SC owners switch to a C&L MAF using either the 73mm, 76mm, or 80mm. You can use a standard 3" intake tube for the 73mm and 76mm MAF's, but you will have to get a 3 1/2" intake tube for the 80mm MAF.
76mm would be a good upgrade for you. If you are on a quest for more horsepower in the future, then it would be wise to go with a bigger injector as well.