If you’re just dying to spend money get the 850. You already have a 750. But you will have learned nothing. What happens when you have to tune the new carb? (Hint, you will have to tune the new carb).
I hear ya, maybe I can run it quick with the 750 when the plugs / wires are back on to diagnose. The throw the 850 on & tune it. . .just not into trying to rebuild the 750 . ..it look pretty trashed