Best race shocks ???

Hey guys got the old dart running finally and running super comp rear leaf Springs and kyb gas shocks the rear end feels loose on the take off any suggestions on a better shock or add onsome to leaf spring that will make it stiffer thanks in advance
monore air shocks jack the front and back up 90 lbs of air. stiffer in *** but you put 100 or so in it its super nice for lanching for even stiffer exteded shackels our dart hooks like a **** with 450 hp smallbock n 4 speed