ken - i have an '81 nautique just got it over the winter and i was wondering what kind of weight u put in yours. i was thinking side sacs (250 lbs on each side). don't have a pic of mine but it looks just like this except blue lettering.
I run a 250 ltr (550 lbs) fatsac behind the engine and 8x40 lb weights spread up the front. This seems about ideal with 3 people up front and 1 sitting on the fatsac. If there is only 4 of us I will also use another 150-200 lbs in another sac at the back. Stock engine with a good 13x13 prop has no probs pulling out of the hole and holding speed at 21-22mph is relatively easy.