Larry, thanks for your post, it's one of the best lump explanations I've read around here. (Usually the posts say that lumps are better than gold, because they improve flow, etc. We never get any more detailed explanations.)
So about the valve bosses, the best thing would be to either taper them or remove them but then install bronze pressed-in guides? (I guessing here but, these guides probably stick out and end up in the same place the original bosses were at??)
