Chill... On a sunny Sunday afternoon there's a high chance some of us might be out burning fuel!
Prop wise the only way you'll find out is to go out & open the throttle. I guess from your info on the left you may have just bought the boat? If it's a nice lightweight hull, chances are you will need to up - pitch. If however you are going to have 3/4 ton of dive kit aboard that the previous owner dinlt carry, the extra Hp might be the difference between actually hitting max RPM or not.
Classic example, I got an engine off the back of a cabin cruiser. On the first outing I chickened out at 6600 at about 3/4 throttle
and promptly bought a far bigger pitched prop. If it's a secondhand boat / engine chances are you'll have a different setup, regardless of the 20% extra power!
Bottom line is a test is the only way to find out. Worst case you just have to be mindful of the revs for the first outing.