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Definitely Black knob with engraved white filled pattern, unusual chrome plated floor mounted box mounted to tunnel with unique boot. Lever is somewhat like described above but has one more bend, no lockout. Good luck if the box is missing, seldom seen part.
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I see those humps all the time on e-bay.One listed now and another on craigs list
http://cgi.ebay.com/ebaymotors/1967-chev...tem150222541508
http://sfbay.craigslist.org/sfc/pts/597003361.html
This guy will also produce whatever knob you need with whatever thread if repo is OK.
http://cgi.ebay.com/ebaymotors/3-Speed-C...tem330210354931
The handle is going to be the hard one for sure