Mine is set to 10 to 12 degrees with the vacuum advance disconnected and plugged. You may have to adjust the idle speed up. Watch the mechanical advance come in as you rev the engine. Mine starts to come in around 1200 rpm and is all in around 2800 rpm for an additional 10 degrees for a total around 20 to 22 degrees. Now hook up the vacuum advance and check you idle speed. Adjust back down to normal. Your timing should jump up to around 22 to 26 degrees. Now rev the engine and you should see the 32 to 36 degrees. I have attached a link explained by Lars Grimswuld, should be in everybody's file.
http://www.lbfun.com/warehouse/tech_...t%20Timing.pdf