Springs from a 240 on a 280

First will they fit, second I have heard they are apporx 1 in shorter, I am wanting to lower my Z but dont want to go with a non Datsun part, wondering if the 240 springs are shorter and if they will fit on a 1977 Z

Any help will be appreciated, Im running 205/50/15 tires but want to reduce the gap from the top of the tire to the bottom of the fender and qtr. I like the size of the tire , have considered 205/55/15 but am not sure that I will like the more narrow look of the tire.

CAROLINA Z