My conversation with Dave Bisshop was for the little HP increase for 10.5-11.0 for E heads why take a chance if you get stuck having to get some low grade pump gas while really street driving it on an expensive motor? We went with 20cc dish with mine on a 455 to stay 10.25. I had the 72s in case we were to put them on a 400 they would interchange and not be too low.
On the dyno increasing octane over 93 did nothing for the motor.
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