Can look at mine tomorrow. Believe mine set back a little but don't think it's a half inch. More like 3/8's or so. Don't think it really matters as long as they don't hang over. I've seen them come all the way to the edge almost and then some set back some. Can't remember seeing any setting back more than 1/2 inch though. Lots of the same parts can very on these older mustangs from one car to another. You can barely see a space between the edge of the boomerang and the quarter in the pic if you look real close
My '70 Pro-Street. Mildly built 302, Mallory 6AL ignition, Hurst w/4-speed, 74 Maverick rear w/3.40 gears. Tied frame with 6 point cage. Trunk mounted battery, Dynamax Exhaust. Building a 351W 40 over now...