Welcome, I think it may be different from year to year and depending if it is EFI or a HO/EFI. Go to the Fourwinns past product page and you should find everything you need to know.
http://www.fourwinns.com/past_product/specsI have a 1995 OMC 5.8L EFI and they say 255 horse. But I've heard 265 also. It doesn't really matter, it is what it is, but as a man I'd rather say it is 265
Good stuff in that past product website.
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Shawn
Washington, Iowa
1995 Four Winns 220 Horizon

5.8 EFI 58FAPHUE