It's probably been asked a thousand times but I can't find a search feature on the forum...

Engine is a '59 Fairlane 292- as far as I know it is stock, so according to my book, it's 8.8:1 compression.  I know a lot of people subscribe to the thought that they only run 91-93 octane in older engines.  I've been running 93 in this since I got it but don't think I need to.  There is one school of thought that said to divide your CR by 10 to get the octane you should be running.  That doesn't work past 9.3:1, though.  

What are your thoughts?