Carbs would a step backwards Imo. Restrictor plates are easy to enforce and they limit power not just rpm. tons of racing organizations use them, Nascar, WRC, formula 1 etc. They can be used with fuel injection. Impound the winning boat after a race and check the plate, easy to keep field level. and cheap it could be as simple as a 1/4" plate behind the throttle body, they cost what $50? it would be easy to keep extra on hand and they would take 5 mins to swap out, they could be teched with a digital caliper. Even if you tried to build a bad ass g whiz cheater engine it still has to breath through that small whole, and probably won't mean a damn thing.

OL Did there home work, all of the 29' run fast for a given power. There will be no easy way to make that fair.

Anybody else notice that SMB OL and WYB fountain didn't have there stars and strips on the hulls? or did I miss it? or were they exempt?