yeah, as long as the springs dun mess with the ride height too
much, then i guess shd still b oright.
bunny, if ur dad finds the "springs" soft, the prob may not lie in
the springs. in any suspension setup, the shock absorbers should be
the ones doing the primary job of damping. the springs are there to
"cushion" the oscillations the shocks go through (if any). if the
car is "bottoming out" too much, it could be the shocks are not
stiff enough to stop the car from doing so.
changing to stiffer springs may alleviate this prob, but
ultimately, u'll still want a stiffer pair of shocks to prevent the
weight of the vehicle to rest entirely on your springs as this will
cause your ride to become bumpy. remember, spring bounces, shocks
do not. 
