[washington blue]

there are 2 holes in the frame the assembly book calls reference holes and you can see them in these pictures. When I was sure the frame was square I used these holes for lots of measuring points. The line scribe in the frame just behind the holes is the center-line of the 55 axle. I don't think this is really important because the firebird subframe is mounted with eye balling the tire in the fender opening so it "looks right". these holes were important for me so I got the square tubing measurements just right. It was difficult to measure from the back end with the cab in place so I was glad these 2 holes were there.