As I can’t get on the late bay to post in the fitness thread I’ll stick it in here
I ran the Northallerton 10k today in a sweltering 24 deg heat
Finished 239th out of a thousand people
Came in at 53.24
No you don't have to run twin carbs and yes the 34 pict 3 from a twin port 1600
If you want to add a more lairy cam and rev outside of the stock rpm range then you would have to upgrade to twin carbs.
Increasing the cubic capacity of the engine along with the long length of the standard intake...