Hi Mo,
Nice boat.
I had the same steam plant many years ago (about 20), in a Victoria.
The engine, powered from that boiler, can only just about move the boat along. Plus the engine isn't really designed to last, it is based around Wilesco's 'toy' engines. That was why Krick (the manufacturer), very quickly swapped over to using Cheddar steam plants instead of Wilesco.
I had major problems with the brass boiler. Within a matter of months, the gas fumes from the very inefficient burner had caused the inner funnel tube to leech out all the zinc from the brass, and it went as thin as tissue paper and sprung leaks all over the place. It was duly despatched to where it belonged. the trashcan.
Sorry to be the bearer of bad news in your hour of joy, but it did need to be told as it is.
IMHO what you should do is try to sell the engine to a collector as a complete unit, and look around for a good commercial steam plant. After I modded mine to a 'Puffin' it sailed for many many years, with no problems at all. I still have the Cheddar steam plant and the hull was sold a while back.
John