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Peter, not much to add here, since I have the 600/5.6 ais, not the f/4 version. Anyway, I just suggest you to consider the TC14E, filling off a small metal tab allows this TC to work flawlessly with any long MF lens. I suppose optics are slightly better than the TC14B.
good to know, although the 14E is quite a bit more expensive, but in the big picture it's the big lens that is expensive, not the converters.
Full MF thread disclosure: I am also looking at AF versions of the 600, but only those of about 10-12 years ago. The new VR stuff is just stupid expensive.