Dave Rycroft worked that prop over for me. It was not even close to the same prop when he was finished with it. The blades were about half the original thickness and razor sharp on the leading edges. He left a ridge on the trailing edge. The water stops (slows) momentarily before it goes off the blade. Causes the prop to bite like crazy.
A B&M blown small block turned that 27 pitch prop 5,200 RPM with a 1.36 ratio Alpha SS.