Crabbing

RustyRatRod said

There are what's called "dedicated" holes in the frame rails for measurement. They normally have a turned up lip all the way around the perimeter of the hole. The lip turns up into the frame rail. That's what the holes are for. There are fixtures that the car sits on, on those holes for measurement, with the datum plane beneath the rack for reference.

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I'll have to remember that, might get my Duster checked out just for the heck of it. After what I've seen doing all my suspension and chassis mods I doubt it's perfectly square/symmetrical, none of these cars were when new anyway and I know mine was in at least one small crash at some point in its life. And mine is being built for road racing so that arguably matters even more than for drag racing.