Try reading this from Lars Grimsrud, good stuff!

http://home.comcast.net/~chadwick.robert/howto.pdf

http://members.shaw.ca/crussel/hei/HEIPrimer2.html

http://www.corvetteclub.org.uk/files...istributor.pdf

http://65corvette.nonethewiser.net/t...um_advance.pdf

http://www.chevelles.com/forums/printthread.php?t=19938

The last post contains the non-HEI and HEI vacuum canisters.
I have the HEI dizzy and use the AR-31 the "aggressive" canisters and that solved all my problems with pinging. Canisters run about $10 and are easy to install.
Hope this helps and let us know how you turned out!