Weber carb configuration?

Dear MB friends:

Have a newly-installed redline weber carb kit (38DGAS) on my '74 280.

I bought this nice, clean kit on ebay some months ago, whose seller said it was previously installed on a 280.

Can't get the thing to idle and run smoothly; I was told it was a matter of experimenting with the various jet combinations possible, primarily focusing on the two idle jets.

I took the liberty of purchasing a "weber jet pack", a plastic box with a number of jets of increasing sizes; have yet to find a combination that really improves things.

The Weber help people told me that the jets that come with the carb kit originally are the ones that are recommended. I've established that the idle jet, for instance, is theoretically supposed to be .045 - that's what I've started with. (By the way, thanks to Catrinus for sharing his info as he installs his Weber.)
Now, seeing that this Solex-to-Weber conversion is seemingly commonly recommended, someone out there must have first-hand knowledge of the Weber setup that actually works on this engine. I would love it if someone said "Oh yes- I have that very carb on my 280, runs great, and the jets I'm using are....."

thanks,
Will