I own a 31 Fastec with 7.4s and thinking of adding superchargers.
Does anyone have any experience in this?
Thanks

The type of hull is somewhat irrelevant as far as mechanical issues go. The 7.4 mpi is a terrible motor for any supercharger, the internals simply won't hold up. The 7.4 MAG will do just fine.......the hull can handle the extra power and will likely gain 5-10 mph depending on which system you go with.

BTW: I had a 312 with 502's and it ran 75 like it was on rails.