My LX sedan had Kings standard low front and rear, (KHFL-14 KHRL-12) with the LS1 the front was taller than the rear so I changed the front to the super low KHFL-44 same as the (6 cylinder standard low springs), the car sat very nice and even however was too low underneath for ground clearance and engineering.
I went back to the Kings front standard low and put standard springs in the rear )KHRS-12) then the rear was too tall the difference in the rear between the low and standard was about 40mm so I swapped the standard low rears back in and added 25mm of poly shims and the car is now pretty level and has good ground clearance.
On an un-flared car the standard springs are pretty tall, I don't know how they will suit a flared car.
I have the standard rear springs available if you either want to try them or buy them at a reasonable offer, even have the original box. They were in the car fora few weeks with 1 trip around the block.
The thread Cook mentioned
http://www.gmh-toran...000a9x-springs/