I had an 82 shadow when it had the 2.4 200 ran it with a 24 chopper
67-70 was the best I saw according to water pressure speedo( long b4 gps)
Try a 25-26 4 blade trophy or bravo style you should see mid 70’s with the right set up as long as the boat is not too heavy
forget lake George save a little gas and stop at sacandaga, better yet hit the romp best bang for the performance boating buck