Octain booster and compression ratios

["DENNIS COX" <djc@appsig.com>]

I did a compression check on my 67 rebuilt engine and the results are
185 across all 4. A couple where pushing 190.  This seems a tad high to
me.  I do get run on but no audable pinging.  I'd like to know what are
your experances with octain boosters.  Are thay pretty much all the
same?  How much do you add to a tank..  etc..  etc...