Not sure if this is old news or not but I ran across these and thought someone else might be interested also. There is some good info listed here also. I ordered some and will try the 10° bushing for 24° intial 34° total and go with 1 light silver and one light blue.
http://www.4secondsflat.com/MSD Distributor Tuning.htm
http://www.4secondsflat.com/MSD Distributor Tuning.htm