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I have a 70 2 wd with a 292, 4 speed and 4.11 gears which I think come standard with the 6's. It will pull hills in 4th gear like there's nothing that will stop it until you run out of rpm at 65 and she is screaming. My run around mileage is no better than 10-11mpg. My friend has a 67 2wd with 283 factory 3 speed overdrive manual with 3.73 gears now and he gets an honest 18 mpg down the highway at 65. The 292 is an interesting and fun hd engine but my 67 4x4 is going to get a ginny original 37k mile 283 2 barrel and I plan to run a turbo 350/205 transfer case with 3.73 gears. Nothing runs smoother than those 283's and the mileage is respectable if you drive it nice.
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