[tubman]

The only definite advantage I can see is that if you should want to do some modifications to the engine down the line, or need to rebuild it, parts for the later engine are cheaper and easier to come by. The rod bearings in particular can be difficult to source, expensive, and need special skills to fit. Of course, there is more potential in the later engine when it comes to increased performance. However, if your current engine is in good shape, runs cool, and has reasonable oil pressure, I would suggest staying with it for the present time and putting the 8BA "under the bench" for future consideration.