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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,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 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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