The Johnson SS I bought was described as a 'Stunt Supreme.' It was a .32 displacement, and one of the few "dimensionally challenged" big shaft Johnsons you may have heard of. I never got it broken in enough to run a clean stunt flight... Stopped VERY hot in less time, on Fox Superfuel! Shaft clearance seemed the probable cause.
The small-shaft Johnsons, basically Orwicks, ran fine, strong and easy. (Memories from a 17 year old at the time..)
I DID fly a (no special version) Johnson 35 at a Mirror Meet, as an AMA Senior, in a kit Magician with minimal mods (tri-gear specifically.) I'm blessed with a mental block about score and placing.... First model I flew over 100mph was a Quicker with another (no special version) Johnson 35 on Missile Mist, I think. With U-Reelys, line length was approximate by +/- 10% or more, actual speed could have been quite different. A thrill, though...