240 Z springs are not surprisingly stiff. That is what I used on my 1200 track car (about 1/2 of each one) to lower it and it wasn't too stiff. Using them full length or close to it would offer pretty good ride quality and more suspension travel. I would think that using a custom lower control arm would be necessary as raising the car too much without a longer lower arm would compromise camber, etc.
The red 1200 body on the Suzuki Samurai chassis is a neat idea but it really isn't a 1200 then.
