Don't know if this will help much, but here are a few shots of my 67. New springs front and rear. 5 leaf in the back. It sits a little lower in the back than the front, and has 15 Rally II's, and the driveway is sloped down hill... but you get the idea... I hope? All in all it's a pretty stock ride height.

Brett - 67 Drop Top 455!
http://www.brettliukkonen.com/1967FirebirdPixPage.html