um wow.
you are very confused and new to the world of suspension.
get under your car and first find out if any of your arms are bent?
no..? good.. you wont need to replace these unles you bend them or know why you should replace them.
bushings.. energy suspension makes a pretty cool little kit. check it out.
if you want to get into drifting, bypass the whole strut and spring thing.
find some good used basic coilovers..
suspension is kind of like something you will learn about the more you get into it.
and a 240sx will go as low as you want it to without worrying about shit.
maybe rolling the fenders but thats not till youre into wheel fitment.
and thats in the next issue.