Calling 1fastboat.(prop ?0

[rescu.tech]

Hello folks, I am new here but have been lurking for a while now. I have a question about my new to me boat. I have own a few boats over the years nothing fancy mind you. I have been fishing out of boats since I was a kid. But now I have what I call my nice boat. Its a 2002 alumncraft navigator 16.5 with a Yamaha f60a 4 stroke with what I am guessing is the factory prop. My question or questions are about the proper Prop. I have beed reading all about it here and it sounds like this is the place to get started in the right direction.

The details, Max rpm 5000( specs say 5000-6000 in the book).
Top speed 30.5 on gauge I will ckeck with Gps next time out.
I also think the motor is to deep, I measure it and I came up with 8 inches
The motor is mounted in the second hole form the top and there are four total.

So I am guessing I need to raise the motor but what do I need to do from there.

thanks
Clint