Not sure in that year of A body, but 70 A body has alignment holes down the driver side of frame. 1 under cowl, 1 near trailing arm mount, and one at rear of frame.
I used them when I put my body on frame and confirmed that body was parallel to frame, but it was certainly not centered...was shifted over one way by over 1/2".
I think they are useful to get body located front to back, but I would use a tape measure to get frame centered side to side or else you may have uneven tire clearance on one side if running wider tires.
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Michael
Oshawa built 1 option Judge basket case. 463, SD KRE 295's, CNC'd factory intake, Cliff's Qjet, Stump Puller HR cam, RARE RA manifolds, Pypes exhaust, T56 Magnum, McLeod RXT clutch, 3.42 12 bolt. 24 year project almost done... 
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