80's shouldn't be a problem for the new engine. May not get there with your current setup. Sounds like you need something in the 11 x 16 maybe even a 17 if you are spraying. Of course you can't get something for nothing so to get the most of the top end you have to give up some hole shot. If you want the nitrous to give you more top end you may want to consider 2 props $$$. For the nitrous to give you more on top you need to have the boat overpropped so that you can spin it up to full RPM's where you wouldn't be able to without the nitrous. For the blistering hole shot stick with a good 3 blade maybe an 11 x 15.