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Re: High compression engine and pinging
I would go with the timing suggestions as well. The cam can play a lot into it as well. A slightly big (I know that is a bit ambiguous) cam can actually help as it will bleed off compression at lower RPMs, but that might not be a first fix.
11.2 is a tad high but not totally unreasonable, except for maybe those heads. even vettes nowadays run 11:1 and don't have to have 90+ octane fuel. My dad ran a 10.25:1 BBC for 17 years with only 87 octane and drove it all over the country.
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