For a motor with stock to 292 cam and hi-comp pistons.

Idle jets: 50f9 (tune your idle mixture too). Idle jets after the 2000-3500 RPM transition. A 45f9 idle jets will not have the torque down low that a 50 can have.
Main jets: 120 to 130 if running 34mm venturis.The bigger the number, the richer across the rev band - except idle. Use even bigger jets if running bigger venturiis.
180 to 200 air correction jets. The bigger the number the leaner (in relation to the main jet size).

I strongly suggest that you buuy any book about Webers.