I got my 836 with the UPP carb adapters running; it had been stuck but I oiled it and got it loose. I took it for a test ride, its a smoker and after a run up to 80mph, it didn't really pull I slowed and took the ramp where it soft seized.
I still haven't seen another set of the UPP manifolds for sale. I'm planning to get an 890 top end kit.