'Stat Housing Question- LA 360 Torker II vs. Rpm Air Gap

I have a Torker II. Sometime in the future I want to get an RPM Air Gap. I read somewhere that a different 'stat housing may be required for the Air Gap. I couldn't find anything definitive. The picture shows the bolt pattern turned a bit from one manifold to the other. That in itself shouldn't matter; the outlet points straight up. But because I don't have an Air Gap, I don't know it the distance across bolt-to-bolt is different, or maybe something else is different. Maybe what I was reading was in reference to a Magnum?
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