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hi ya
The Z codes 10.5 to one compression dictates premium fuel anyway and todays fuel isnt the same as when they were made. my 64 pings on anything other than 100 octane.I have changed the jets and had the dizzy recurved to make it tolerate 98 pump gas, but under load it will still ping. If i run 98 and the octane booster it goes hard and no noises but they are dear enough to run without having to resort to that, so i only add the booster when i know im going into the hills or its hot and im going to have the ac on all day.
hope this helps
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