I would take that flywheel to a shop that resurfaces them and see what they say about the cracks. If they're not too deep, resurfacing may get you back on the road.
Are you planning on reusing your pressure plate and clutch disk? Not a good idea.
You could go with a clutch kit and matching flywheel from RockAuto.
If I'm correct, going by the 1958 235 crank I installed in my 216, there should be three pins in the crankshaft to locate the flywheel correctly to the crank, with one of the pins being slightly offset from center between the two adjacent bolt holes. Your flywheel shows that matching pin hole on the upper part of your pics.
