78 280z. Bought the TTT setup and had 250 front , 300 rear on konis. Felt too soft, swapped to 300 up front. It is slightly stiff but feels much better than the 250s. 250s are way too light for the rear. The shocks are probably around 2/3 compressed at ride height. Just bought 350s, haven't installed them to know if they are going to be too stiff, but at 1620 rear weight with me, spare, full tank, etc. it should be around 1/3 compressed at ride height.