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Re: 4.3 V6 vs 283 sbc
250 inline six with a 2004r, 3.23 gears. Runs nice, lots of torque, and OD gets the mileage back.
As a reference point i consistently got 23mpg on my 1990 GMT400 truck with 4.3 TBI, 700R4, 3.08 gears and P235-75R15 tires. And it would tow 7000#. Sold it because it didn't seat 4, at 210,000 with 1 trans rebuild, 1 water pump, 2 ignition sets (never will buy Accel anything again), tires, brakes, and 1 belt. SO yes, the 4.3 does just fine for a DD.
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1987 2 ton 
1982 250/TH350 beater in progress
Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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