But I'm not sure how to set up the microphones. Should I place the 4050 with figure 8 pointing to the left and right, and the DC96 (cardioid) at the same location but pointing towards the source?
And how do I use the M&S outputs on my preamp?
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Yes, point the lobes of the figure 8 left and right and the cardioid pointing straight ahead. Try to position the diaphragm of the DC96 so that it is directly perpendicular to the centre of the null on the figure 8.
I have never used the Joe Meek pre so I don't know how the outputs work. I can say that on the Amek 9098, the cardioid mic goes into channel 1 and the figure 8 goes into channel two. Upon playback the cardioid track is panned hard left and the figure 8 track is panned hard right and it all works out. Blend in the amount of figure 8 to control the stereo width.
If that doesn't work, take the output from your figure 8 mic, copy it to another track in your DAW ( I assume you are working in some sort of computer-based system) and flip that track out of phase then pan the two figure 8 tracks left and right and put the cardioid track up the middle. Blend to taste in order to get your width. When your stereo tracks are summed to mono, the figure 8 or "side" tracks will cancel and you'll be left with the cardioid mono signal if mono compatability is a big issue.