If you
need the choke (need or "can use"??) you are not rich on idle. On idle only, that is. Flames were there with the stock too, you just didn't see them
Too many baffles in the stock muffler.
Before going further, here's the mistake I did - I put the K&N cone, HD wide ID muffler, larger idle jet, larger main jet and reduced the washer by 1/2. All in a single sweep. Quickly I realized - it's not gonna work. I kept the K&N and muffler, but soon rebuilt the carb OEM, as it was. And then took it one step at a time. Idle jet first. Then the needle. And then main. I am still on main jet phase
Change, adjust, test, test, test, then move to the next step. My 5 cents.