Hey Master, do your mounts place the engine lower and further back than the Z31 ones, cause I'm fitting some right now and while corner weighting the car I noticed that the engine is'nt in the optimal position for weight distribution.
I had found, a while ago, a set of mounts from an Aussie company that made mounts to put an RB in just about avery rollling thing made by men, short of a 32 deuce coupe and these mounts for the Z put the engine just in the right place so, if your mounts are of the latter design, I would happily order a set from you. Better encourage a fellow Z nut than any stranger from an other continent.