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Re: 1968 c10 396
With iron heads and today's fuel 9:1 is right where you want to be.
Personally I would run it on regular with as much timing as it will safely take. Then if it just won't run without pinging with a reasonable amount of timing then step up the octane rating.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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