Ive done R31 struts with 1200 spring perches, even though the 1200 perches are small i machined out the center to fit skyline strut, also allows the car to sit lower roughly 2"
The control arm is the next thing to nut out, skyline, 200b, gazelle control arms they bolt up the same,
the outer tierods are also diffrient sizes, thats what i have that at the moment to play with,
the booster.....well that another thing!!
what diff you using?, im using R31 skyline diff from a wagon 3.89