I would find the root cause of your miss problem first, get everything running right with the original carb first. Otherwise the problem will follow with the new non-original carb and it will be a nightmare to tune. I think you would just be making it harder for yourself to fix the problem. If it was not the carburetor, it won't go away. And you don't know what it is at this point.
Like I said, I had a slight miss too that never went away no matter what I did. Valve guides were very worn and valves leaking, not enough spring tension, and two cam lobes were worn out. Basically the head needed to be rebuilt and cam replaced. Measure how far the valves open or how much each push rod moves up and down to see if your cam is still ok. A dial indicator would be the best tool for this.
