Measuring centre of wheel to guard? I've got SSL all round and rear is 5 mm lower than front which makes th car sit quite even overall. This on SV6 (pic attached) so a V8 would be 5mm lower on front.
Is it possible one end has VE springs? Happened to another member? SS Flo Rida I think and it throws you off. Check the springs are KHFL151 and KHRL152. Just trying to help you avoid unnecessary disassembly reassembly.
All else being good though losing an 'S' on the rear will raise it by 15mm. The differences between steps are 15mm rear and 10mm front for Kings.
Cheers.
View attachment 191766
Edit rear part number.