I was just talking to a guy the other day who did a 6 l LSX swap and 4L80E Ford 9 in 373s into a 67 chevelle. He said he's getting about 16 around town. Which isn't bad. No emissions controls and it definitely smelled rich when he fired it up. Probably if you super tune it without emissions controls and kept your foot out of it I don't see why you couldn't crack 22mpg on a steady cruise.
The other thing about a fuel injected swap is it does the same thing every time all the time. No worries about the carburetors going out of whack or running ethanol gas.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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