Interesting. Assuming these were "supposed" to be 450 front / 325 rear, they're not far off.

Just to add a data point. I used those blue springs 450/325, msm bilsteins, nb top hats, 27mm/15mm solid bars, nb bumb stops cut in half with good results for street/autox/track back in 2008. Had them on for over a year with 20k miles, 100 autox runs, and about 20hrs track time. We measured front and rear by measuring the springs, then stepping on them and remeasuring. Highest change went in the rear, done with two guys and a tape measure.

FYI: there was something about the rear that was slightly weird, either they would only go so low or so high can't remember, ended up with good pinch weld measurements.