351 stroker baby! 427! Can we say 7.0L! Woo Hoo! Screw gas mileage. You want it bad enough, you know you'll spend the money to keep it no matter what it does and stress it causes. I'll never part with my Stang. Worst collateral because I'll never part with it. OK I'm done
If your main concern is worrying about spending a few extra bucks a week on gasoline, your in the WRONG hobby Just because its a 351 does NOT mean it'll get worse mileage. EFI will get better mileage. JUst like that myth that high gears kill your gas mileage