I'm running a Momo 320mm wheel with the NRG Gen 2.5 SRK-250BK quick release and their SRK-170H Short Hub.
The column housing to wheel mounting surface is 4-1/8" with the quick release and short hub. Beware: Their standard hub puts the wheel in your face!
I've had the 320mm wheel over 20 years and really like it, but I wouldn't go any smaller. FWIW I'm also running 12.7:1 ratio steering box.
Another thing to note is the NRG setup eliminates the typical 'crush hub' wheel adapter so you're compromising safety and should run a shoulder belt at a minimum.
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