1980 280z 2+2 adjustable suspension?
 

like the title says,i have a 1980 280z 2+2 that my grandfather passed down to me when he passed away, and being that i've grown up with only classic muscle/hot rods,i don't know much about these cars but i enjoy improving/modifying cars,and some of the 280z suspension is OE junk so i am looking for anything and everything adjustable all i require is it be on-car adjustable,no weld-in stuff,and good quality parts

any suggestions are greatly appreciated thanks