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I have a late 60's to early 70's 13' sport that's stripped of the stock interior. Motor is a 1981 Evinrude 25hp tiller steer. The prop is in bad shape it needs a new one...

1. Can anyone recommend a good source for a new one and how to figure out the correct size & style? Any options for more low end or top end speed when doing so?
2. I've never replaced a prop before but pretty handy. Just been a while since I've worked on anything. While replacing the prop is there anything else I should do or anything that needs to be replaced each time the prop comes off?

After this I'm leaning on trying a hydrofoil. The boat gets off plane pretty easy at low speeds and I would like to be able to cruise slower at time. Think this should help?

Thank you,