Re: Rebuild for unleaded fuel
I rebuilt my 352 from my '58 TBird in 2005. It originally had 10:1 CR. Am not sure about the CR with the aftermarket pistons (.030" overbore) but they are probably in the high 9's anyway.
I went with hardened valve seat inserts and stainless valves. The original heads had no inserted valve seats; they were simply part of the heads.
I have put about 6000 miles on it since then. I run "regular" gas and have had no pinging problems at any time. I run stock timing.
The only additional thing I can add is to have the best possible cooling system you can - overhauled radiator, 6 blade fan, even a fan shroud - so you don't have contribute to the problem.
You could also go one heat range "cooler" on plugs.
All that stuff said, my car leads a very easy life and yours may be used to haul boats on the highway in July in Colorado, so the load put on it becomes a factor.