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everyone of the articles from different sources say that you can run regular unleaded with 8.82:1 compression. So I built a junk yard 460 1974 ish year with a set of dove heads. no block decking or milling heads, just a resurface on the heads. with a .040 head gasket gave 8.82:1 static compression ratio so anyway built the motor and had to run 93 octane unleaded because the motor pinged with exceleration my theory is go a head and run 9.5:1 compression with cast iron heads and a 160 degree thermostat and at least 91 octane, here in the south we are lucky to have 93 octane. A lot of this has to do with the cam lobe centers, and cylinder pressure, and a good ignition system, such as MSD or accel or Mallory, with a hot coil will also make or break the pinging and detonation problems, and save the motor. Now we are talking street everyday driving ,or at least on the week ends with gas so high, now days most people including myself can not afford to drive, a gas hog everyday to work. I love trucks so I built trucks with 460"s anyway just a little food for thought WR