IIRC they will have more arch to them and spring rate should be a little more for a 4-door car
on my 68dart I added an extra leaf to the pack from another spring pack
i used the 2nd leaf so I had 2 2nd leafs in the one spring pack
put mine where I wanted it on the ride hieght
on my trucks,I removed the overload leaf from the pack on the v-8 stepside which has 4 leafs now
on my /6 truck i removed the overload leaf and it has 3 leafs but sits higher than the the one with 4 leafs
go figure
/6 springs deff have more arch than the v-8 springs and are both short bed 1/2 ton trucks
IMHO,if it has more arch to them they will set the ride hieght up some and may be what your looking for
if its still too low,then just add one more leaf to them
the main leaf with ends cut just behind the spring eye will give the most lift or add the 2nd leaf to your spring pack