There has been plenty of talk about OptiSparks on CamaroZ28.com message board.
Go to the site, and go to the forum and do a search for OptiSpark or DynaSpark.. You will get tons of results with TONS on good, useful info.
Hope this helps with the fix. I just replaced my opti on my car about 2 months ago. =)
<DIV> Would any of the posters on camaro.firebird happen to
know of a mail order seller of electric distributors for our 5.7 Ltr. LT-1
engines. I need the now popular Opti-Spark Distributor, but I was
looking for a more economical source than the typical dealer. I was
looking for some source outside of J.C. Whitney, e.t.c which may be a little
off the beaten path.</DIV>