I am running 11:1 with aluminium heads and a .043" quench on 91 Octane, 93 when I can get it. No issues. Cam is a little bigger at email@example.com" and 110LSA. I run 36*total timing in by 3000rpms. I use vac advance to add 8* more under cruise.
Read your plugs and add timing a little at a time.