That boat is a 41 Apache which was once named Stillwaters I believe. I don't know if that's the name now. 11,000 lbs dry is certainly doable on a 41 Apache, I do not know the layup on this one.
#4's are okay, harder and harder to get parts for, but those look like number 5's to me with the spacer in the leg. Anyone know for sure by looks?
That boat used to run around the Sandusky area from what I recall, then went to New Jersey I think.
If you look up the United RAcing Engines website it will tell you about their latest variation of those motors. Give them a call if you're serious.