i have 200# springs and those are almost too hard for the street. Just go fast and the road smoothes out. nismo had 110# for the 1200 listed. 90# was stock on my vehicle. I don't weigh enough to get my car to move when i push on the bumper.

realistically, you'll need to have it weighed and set heights and corner weights, but it's still worlds better that stock.

ESPECIALLY the brakes!

btw, 240sx is what the inserts and coil spring etc come from, so there are very nice adjustable struts.

A 120Y is a b210/210 in some of the other places. sometimes a late model with square headlamps.
they have a chassis code of B310... it gets messy


there's also some talk of using a later 4 lug 350z spindle to help with the widening of the front wheels.

but wait!!!

wheels?

14" minimum. 0 or +12 offset or something wacky like that. get the wheels that car ran with...

you'll probably need spacers :( but I've seen a bunch of big money 280zx's and they can't find wheels either without big spacers.