Lots of f-bodies get high 20's with 350's. I have put 350's in s10's for friends that consistently get mid 20's with 250-300hp. If I'm pulling 22 ( 20 lowest in the last year) in a 5300 pound truck, with hd trans and 14 bolt full floater rear end. A 3200lb? Elky with a 2004r, light duty overdrive, and 2.73's should do quite well.
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