Good find?
Setting it to "stock length" is a good starting point. I suggest using either a couple of plumb bobs, if you have 2 of them, or the "poor boy" method of 2-3 large hex nuts on the end of a piece of string, and make sure the rear is exactly centered.
Tape the string to the side of the car, so the plumbs or nuts are over the center of the rear wheels. Adjust the panhard bar so that the distance between the string and a fixed point such as the outer edge of the rim, is equal on both sides.
I've seen OE ride heights all over the map, and since the panhard bar moves the rear end in an arc, the rear might not be centered, even with stock springs.


