Consider off-center shaft
I like Kito's solution.
For anyone considering repowering a H30, consider mounting the engine a little at an angle to allow the shaft to slide past the skeg. The engine logs should be wide enough to allow for drilling new mounting holes (after the old ones are filled). On the C44 the angle is 7 degrees (both down and to the right). On a boat with a separate skeg-hung rudder (as opposed to a full keel) you won't need anywhere near this-- about 1-1/8" in about 6 or 7 feet. It'll amount to nearly nothing in course bias.
The rule for an off-center prop is that the top blade should turn inwards. If you have a righthanded motor (as viewed from astern) the shaft should be offset to starboard.
I like Kito's solution.
For anyone considering repowering a H30, consider mounting the engine a little at an angle to allow the shaft to slide past the skeg. The engine logs should be wide enough to allow for drilling new mounting holes (after the old ones are filled). On the C44 the angle is 7 degrees (both down and to the right). On a boat with a separate skeg-hung rudder (as opposed to a full keel) you won't need anywhere near this-- about 1-1/8" in about 6 or 7 feet. It'll amount to nearly nothing in course bias.
The rule for an off-center prop is that the top blade should turn inwards. If you have a righthanded motor (as viewed from astern) the shaft should be offset to starboard.