HI Sopwith21, I'll throw out one more combo....72 240z SCCA ITS I've ran F/R spring rates 400/300, 375/300, 350/300 , Last year I settled down with 400/300 koni D/As, without R sway bar, front bar about 1", quaife diff. zero rear toe, 1/8 toe in front....... Handles fairly neutral. I to have heard the reverse combo of heavier springs in rear, but haven't tried..."Mine works" for me. YMMV.... BTW...Keep a eye on your Link Mount Brace..."they help locate the rear of control arms". I just noticed mine were tearing, or breaking at bolt holes where they attach to the body .....lots of over steer... :surprised Waiting for next race weekend..... David Spillman