11 to 1 on pump gas
I'm running 11.0-1 on my 360' j heads,,full port, big solid comp cam, single plane Holley strip dominatrix intake, Holley 870 street avenger carb.
Run 93 pump gas and a bottle of octane boost on fill up.
34 deg total timing....idles around 1-k. Runs cool but hot summer days it may climb a bit.
No problems for the past four years.