I have a question for the engine gurus. I have an opportunity to buy an IO-360 A2B engine. Looks like it has the forward facing sump so it is what I wanted, but I am not familiar with all the different variations. Looking at Wikipedia list of O-360 variants it says that it has a modified crankshaft to accept a fixed pitch prop. So does that mean it is a solid crank that can't use a constant speed prop or does it just mean it has the plug in the crank that can be removed to accept a constant speed? Anything else I should know about the A2B?