Look at these threads about which Weber to get, what's needed additionally and what the installation involves:
http://www.mightyram50.net/vbulletin...869-Weber-swap
http://www.mightyram50.net/vbulletin...ebber-carb-kit
http://www.mightyram50.net/vbulletin...10-Weber-32-36
There are many other threads and posts concerning the Weber, so search the site. There's a wealth of information available to answer all your selection and installation questions.
Will it solve the rough idle issue? It should IF the problem is due to the Mikuni. It very well could be especially if the Mikuni is original, but all other possible causes (electrical, fuel delivery, compression, etc.) should to be checked and eliminated so you don't risk replacing the Mikuni because of some other fault.
I don't know the Cali emission rules so I can't say for certain if the Weber could pass the smog tests. That's a question for your local DMV and other California members who have considered or made the conversion.
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