The Judson is a vane-type, positive displacement compressor; and doesn't generate a lot of boost. This is a Good Thing, since it's also not very efficient and heats the air a lot more than more efficient designs (like the Eaton/Roots) do, which tends to cause detonation. The Judson also requires that lubricating oil be mixed with the air (only way to lubricate where the vanes rub on the housing), which further aggravates the problem with detonation (oil has a very negative effect on knock resistance). The original installation included a Marvel automatic oiler that mounted on the firewall and dripped oil into the intake at a rate of about 1 qt/800 miles. Contrary to popular opinion, the oiler was NOT supposed to be filled with MMO, but rather SAE 10 motor oil.
On top of that, the original vanes are phenolic impregnated linen and have a tendency to shed tiny bits into the motor as they wear (or fail catastrophically).
I've got one in my collection, though I've not yet gotten around to trying it. Last time I fiddled with it, I couldn't get the silly little 1bbl downdraft carb off the manifold. There is a nut located where you can't get a wrench or a regular socket on it...
(PS, No, it's not for sale.)
There is a mail list on Team.Net for Judson and other superchargers, but traffic has been really light for the past few years. It may be that other members are like me, and got inadvertently unsubscribed without realizing it!
https://autox.team.net/mailman/listinfo/superchargers
I've got a fair amount of information squirreled away, Karl, in various forms. Email or PM me if you'd like a copy. Unfortunately, a lot of it is pretty poor quality, 3rd or 4th generation copy in some cases.