During my restoration I will get to the engine rebuild. I would like to keep things as close to factory as possible. The L79 had 11:1 CR. I am wondering based on all I have read, can I keep this 11:1 CR and run on 93 oct.? It is still not clear by the articles and comments I have read. Some say yes and some say no. I am confused. This same frame of mind seems to be the same with a couple of engine builder I have talked with. I have been told to install Aluminum heads and I should be able to keep the 11:1 CR. Please give me your input.