I just purchased my first big block, and was wondering what prop to use for the best performance. The boat is a 23' Mirage with the 454 Magnum and the Bravo outdrive. What prop will give me the best performance, and what kind of rpm's should I expect? Thanks for any help you can lend!

Best top end prop will probably be a Mirage Plus. Most likely a 23". You want to prop it so the engine turns 5000rpms with that engine.

What gear ratio is the Bravo? Is it a 1.5/1?

I'll cehck the gear ratio, and start looking for a Mirage Plus, thanks!