With your 270 cam, as Randall notes, you may have to change needles.
I have just enjoyed this book:
http://www.bing.com/shopping/The-Su-Carburettor-High-performance-Manual/search?q=su%20caarburettor&p1=%5bCommerceService+scenario%3d%22o%22+docid%3d%22F9C9CFBCAE7BA7D81D49%22%5d&wf=Commerce&FORM=ENCA
This isn't so much about carb set up, but modification. Half the book is
about modifying the needles yourself. Just swapping needles is a random
affair and you may get lucky. However, with this book, you will have a
methodical process to get to the right needle profile for your cam. You'll
find a drill press very handy.
The book is online for less than $20. ISBN 1845840739.
Brian
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