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Re: C10 Build - what's the latest/greatest swap for best mileage?
Dropping in a 250 or 292 straight-6 won't increase mileage, that is a myth. Best thing you can do is add mast & sail.
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1969 c-10 Step Side Long Bed. I-6 250cid =  = 1969 Pontiac GTO hard top. 400, 4-speed.
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