Mikuni's are similar to Webers. This site might help you:

http://240260280.com/Tech/Carbs/Weber/DCOE Theory Operation and Tuning.html

Fuel injection is an option, but, some upgrades to the fuel delivery (pump and line) are going to be required.  Depending on your Mikuni type, you can set them up for street driving no problem (40mm variant).  However, if you have a larger set of Mikuni's (44mm) they are likely designed for a more aggressive engine setup.  This is what I know about mine, anyway.  I have the 40mm and they are nice carbs (cold starts are a little rough though).

You can buy a set of rebuilt SU's that will last your lifetime.  Ztherapy out of Salem, OR is the best resource for this option.  If you have the Mikuni's, then you'll likely need to buy a new air filter setup for the SU's as well.

Good luck!

Mike