correct me if im wrong. that is a 30 footer w/twins and trs drives. i believe it would be allowed to run class 5. However, it really should be in class 4 (IMO). Not sure if it still has original power in it. It was a very competitve boat a few years back.
From what I remember there were a couple twin small block boats grandfathered in and the thought was twins should jump up to 4. Again Smitty is more than fair on this so if it fits in 5 it would go in 5 (but i suspect its a 4 / 85mph class boat even as it sits).
The only issue with five is the added stability of twin screws is really a pretty big advantage since the races are won in the corners. But again smitty will do whats fair. Either way get that old girl back on the course!!!