I had a 1986 170 that I fished offshore out of Port Canaveral. Most of my time was spent between the reefs 80-90ft and about 120ft. That’s about 15 - 20 miles out. With the shallow v and short waterline, you have to pick your day, and slow down when conditions warrant. The transom cut out is low, and the scuppers did allow some water on the aft deck, but it remained self bailing.
I’m not reccomending that you do what I did. I was young and stupid. The 170 feels really small when you can’t see land. It is small, and you have little margin for error. Make sure that everything is in good condition and you have all the safety gear.
The good news is; you can catch a lot of fish in the Keys without making such a long run. The 170 should be perfect for fishing the patch reefs out to the reef line(and beyond on calm days). It will fish shallow, so you can fish the backcountry too.