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Re: 1971 chevy c10
The Quadrajet will get better gas mileage than a 2 barrel if you keep your foot out of it. A 3.07 gear and an overdrive will be too low RPM's for a 302. I'd stick with the same rear gears and swap for an OD, or swap to the 3.07's and keep the 3spd tranny. 13mpg is actually decent for the setup you're running currently.
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70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam.
79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam.
'03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great
'08 Tahoe LTZ 4x4 155K
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