I don't know but I would get all my engine mods sorted out and then take it to a dyno to tune the weber otherwise:
A) you will be forever buying jets as you change the cam, extractors, inlet manifold, or even filter maybe.
(more / less airflow well maybe not that much but....)
B) To get it tuned yourself you would probably have to buy a selection of jets which will cost you anyway.
It seems easier and better to lash out and dyno tune it and then buy the jets they tell you will work on the motor.
OK so you might have to get it going in order to get it to the dyno tune place fair enough.
Oh you will have to let us know what engine it is and what mods it has and which weber carby you have.