Does your car have A/C ? If it does you will have a different bracket to mount your alternator than the one that came with the car. Early 230's have a metal bracket that holds the alternator in place which was replaced with a cast iron bracket. Personally, I find the cast iron bracket to be better than the early type with all of those rubber bushings and sheet metal cups.
If you have alingment problems it's likely because some of those bushings and metal sleeves are missing. You can get all of those parts in a kit ( I think ) or you can replace the bracket with the later cast iron type. One of the studs in the block may need to be moved or removed to do this. If you end up going this route it may leave an opened hole directly into the crank case of the engine. This happened to me once and a lot of oil poured out before I found the source. A short screw with an aluminium seal behind it will fix this problem.
