wish i could help you guys ....
all i can tell you is i had a similar problem with my 97 OBS.
i ended up getting the kyb AGX's and wrx euro-spec springs.
not sure i would go with that set up agian... ened up with spring gap in the back ....
good luck....

 

Sorry I've been away from this for a while, my suspension has kind of taken a back seat to my other projects. I am going to try it in the spring, as I am kind of broke. I just finished swapping a 440 engine/tranny/ and 8 3/4" rear diff into a 69 Charger, and now I'm trying to finalize a deal to pick up a Cobra Jet motor to go into my 67 Cougar.

I will restart a thread if I get around to swapping the suspension.