i have a 91 h/b w/b16a i just put in tokico lower springs and tokico illumina all around but my car still dives when i hit the brake even with the shocks turned up to 5 and when i hit a bump the hole car rattles like if i have no shock is there anybody who has this set up and what can i do to fix it i had a wheel alinement but noting else showed up that need to be fix please i need help this is my 3 set of shocks and springs btw the car is lowered with the springs from tokico please help

 

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You are going to need a spring with a higher spring rate. I believe there are companies out there like progress that make "hybrid" springs that are specifically designed for cars with engine swaps.

http://www.progressauto.com

http://www.ground-control.com