Let me know the measurements and i'll see how those spring rates will work for you.
Went through this the other day with my mates 3dr. Avo send out their cossie coil overs with 300lb front springs and 200lb rears.
These work fine for track spring rates on a fully loaded saph tipping the scales at 1300 ish kg but on the 3dr that we have got down to 932kg they were far too hard.
Col was complaining it couldn't be driven hard on the road and down a lane i could leave his 400bhp in my 80 bhp van. Hook up off the line was also poor as there was no weight transfer to speak of due to the excessivly stiff springs.
It probably would have handled great on a race track but in reality that is not where it spends the majority of its time.