if you wanna adjust the back your gonna have to get adjustable ruca's and basically replace traction rods n stuff in the rear so they can become adjustable.
i say screw the spacers get solid mounts for your subframe. more likely your stock bushings are welldone. also do solid/polyerethane bushings for your suspension. possibly a short shifter would help (i cant tell if you have auto or manual 300zx trans)
test and adjust the gearing (rear end) also thats more proportionate to your setup.
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Well i have a 95 240 and i like my cars low... But my parents don't like my wheels tilted
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