Here’s a rear shot.

Take the measurement between each set of lines on one side at a time. If you’re runnin’ a straight axle, the numbers should be the same when comparing the close measurement with the 2’ measurement if your front and rears are plumb.

With the independent rears, it’s a different story.

I talked to Clark Kibler & Paul Mellinger (has a Jag shop here in Dallas) today about toe in/toe out for the independent rears. Clark said the Corvette manual has a definite setting listed but he didn’t have it handy. He and Paul both agreed that the Jag’s should be set with about 1/32” to 1/16” toe out. This is due to the tendency of the tires/wheels to pull to a toe in situation when under power. Sorry I don’t have the info on the Vette rears.