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I would consider running a solid oilite bushing instead of that one. If you must though Side A goes to the crank while Side B to the input shaft.
One like this is best. https://www.5speeds.com/cart/index.p...&product_id=99
Back in the day we used a pilot bearing from a GM diesel instead of the pilot bushing and it worked well. Nowadays the available bearings all seem to be made in China and of suspect quality. Most engine builders seem to be going back to bushings. The advantage of a bearing doesn’t outweigh the risk of failure.