MV,
As JP mentiomned, 5.7 L = 350 CI. The 5.0's and 5.7's were available in different outputs For instance, there was a 220 HP, 5.0, and 250 or 260 HP version of the 5.0. Same goes for the 5.7. Note that the 5.0 and 5.7 are physically the same size so there's no difference in weight.
HP is only part of the story, what no one mentions is torque, which is the number you really want to know (HP is a calcualted number) because torque is what actually twists the props. However, assume for a moment that both the 5.0 and 5.7 are rated at the same HP. The 5.7, due to it's increased dispalcement, will make more torque than the 5.0, and will probably do so at a lower RPM.
Anyway, for a boat the size/weight of the 3300 I'd want the 5.7's, preferably the 300 HP, fuel injected version, AKA "350 MAG".
Dan
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