what is your setup?

single 40DCOE or twin 40DCOE?
A12 or ??
Modified?

Air correctors - too lean (large hole) causes a miss at near max RPM, too rich (small hole) it will be soft and not give full power
Main jets - affect max RPM similar to air correctors
Emulsion tubes - affect the acceleration phase from progression onto full throttle and the main circuit coming into operation
Idle jets - affect alot! idle, off idle and progression onto the main circuit are all determined by this!
Aux venturi - also important for response
Choke - as mentioned sets the effective rev range of the engine
Accel jet - purely there to fill the hole created with sudden opening of the throttle causing a lean spot, you should be able to drive without these if the throttle is opened gently enough, don't use them to hide a weak progression!