Did they ever produce a slant 6 4 speed with a console in 1966?

in 1966 they didn't use the 4 speed behind a slant 6

Other people are posting information in this thread, VWG. Look carefully and you might find one with pages from a factory parts cattledog, explaining how and where this '66 with Slant-6/4-speed came to exist.

The 65 and down had a 3.09 1st gear and the 6 cylinder needed that to launch properly

The A833 used behind 225 Slant-6s in Canadian-built '66s had the 3.09:1 first gear, too.

The next 6 cyl 4 speed option was in the F bodies in the mid and late 70's

No, the next Slant-6 4-speed option (in the US and Canada) was the A833OD in the '75-'76 A-bodies. The F-bodies came after that.