MP 284/528 BB cam: Tell me your experiences

What is the rest of the engine combination? The .528 is a great cam, but it is not that large. You have a bit more engine, which will lower the power curve further and may cause issues with too much cylinder pressure. I think you are making a good choice provided the rest of the combo can live with the added pressure, and you lose the convertor if you plan to do more road type racing.