I have owed a 1984 Donzi Hornet III for 2 1/2 yrs now and it has been the source of the "speed bug" that has gotten into me.
I came to the realization that i needed a faster hull in order to get to 80 mph (my goal).
I came across a 1995 24' Python in Jan 2011. The boat was running with a 454 Mag and would run about 62 mph. Not fast enough. I built a 540 for the boat with a goal of 80 mph. On monday I reached the goal doing 83 mph. I built the engine 4 times in the last 8 months. 2 times not my fault, 2 times I take the blame. Here is what I learned and want to convey:
1. If you are going to upgrade the oil cooler, use number 12 fittings and hose and use the biggest cooler you can.
2. Have the rotating assbly balanced.
3. Keith Eickert exhaust is much better for big displacement motors than Stainless Marine. (I gained 7 mph by going to KE exhaust--everything else was the same) I believe i had the first gen SM exhaust.