I do a lot of Hammond organ tracks...and I never use any reverb on them. They are just to rich/full, and reverb just washes it out and makes them too syrupy if they are intended to be more backing tracks than say, an organ lead.
What I've been doing a lot is recording one organ track, then splitting it, and using just enough delay on the second track so that the organ vibrato (assuming you use any vibrato) of the two tracks meets like two combs...where the vibrato amplitude of one track is in the up cycle, I delay the second track so its vibrato is on the down cycle in that same spot....
...then I hard pan the two tracks L/R.
You get a really nice left/right vibrato action, and the delay is more than enough to create a spacious, reverb-like vibe, even though the tracks are 100% dry.
Anyway...try it...it may not work for your purpose, but for organ chords/backing tracks it works very well.