I take it your a wheeler...
But yea, get a new carb. Ive gone to the limit of all you can get out of a factory 22R carb. (power wise)
Its not untill you get a new one that you will realize that you wont miss the factory one.
Get a 32/36, or if you want that edge get a 38. Both are very decent carbs. I run a Holley 500. But ive put several webers on R motors.