It would be tuff to put the Marine Supercharger on for a many reasons. One is clearance in the rear, two no EGR so it would never pass a smog check, three the MAS is part of the rear case and is not DBW, four you need about 6-7 inches of clearance in front of the motor for the pulleys just to name a few reasons it can't be adapted to a AV.
Also they have been making the Marine SC all along for the 8.1L, just not the trucks. This one is just the latest version with the SC on their custom manifold with the intercooler built in and not blowing through the stock manifold.