Thanks for the info Joel.  I have the origional GM shop manual with the same specs as you noted.  In addition to the J-7.91"and K-7.89"  The specs call for approximately (I don't have the manual here at work) 27.9" floor to highest point in fender arch both front and rear.  So if your frame is level (J and K) equal, than I don't understand how the fender arch in rear could be higher than the fender arch in front.  Are you running the same tires front and rear?  If so your 1 inch differential between tire top and fender archs sounds out of spec to me  (not a big deal, but mine is 2 inches out).  I could take out .5" to 1" with longer bolts and get closer to spec keeping the frame close to level, so that is probably what I will do.  Could you measure from floor to fender arch and let me know what numbers you get?  I get 27.75"in front, and 30"in rear.  My tires are 225 70 R15, and I am currently running them at 25PSI.  Book calls for 20psi.  If I deflate them, It would probably lower the frame less than .5"   I will do that and remeasure everything, just for the sake of accuracy.

I get 27 1/2" floor to arch on da front
28 1/2" on da rear. I do have 225-70R15s on it @20psi.

I will agree that it sounds goofy to have the different fender arch measurements, given that the frame is level, but, the body mounts have probably squished(highly technical term!) down over the years, and the front of the car bodywork, which has very little to support it, may have sagged a bit. The only thing holding the front of the body, from the firewall forward, is the radiator core support.
I'll upload a pic from the side, and you can take a look at how mine sits. It does have a little rakish look, but I know the frame is level, so any "rake" comes from design, and old age!

                                                  Click on image


The brake clips will only be available at a Corvette supplier, as far as I know. Adams' Apple2006-10-05 08:27:41

  Your Rear Spring might indeed be Stock but that dosn't mean that A Spring Shop hasn't Rebuilt it with the additude that a  little more Arch is better. I have seen quite a Few Vettes that are High for no other reason. Longer Bolts are the Quik and Easy.