I was big into Z31s, still love them...however I've caught the S30 bug pretty bad and have since majorly downsized the Z31 department, and upsized the S30. I own 1 Z31 currently, and 3 S30s.
My Z31, 86 300ZX Turbo. Originally automatic, 5 speed swapped. It has the original VG30ET with low CR....stock T3 on ~12psi of boost, 3" turbo-back exhaust, FMIC, Nistune, Z3R springs, Bilstein HDs, 88T front brakes....
74 260Z. I'm in the middle of swapping new floor pans and under-floor frame rails/supports into it. It has ~45,000 original miles, but the L26 was siezed up from sitting since '79....I bought it with triple webers, a MSA header, and Mallory dizzy....The interior is pretty mintish, including the crack-free dash and center console. I intend to L28ET swap it in time. I have fiberglass fenders for it, as well as 280Z turn signals so I can use the air dam I got for it. I also have everything for a rear-disc swap for this car.
74 260Z. It badddly needs floors, rocker panels, and a couple pieces in the 1/4s...otherwise its decent. Battery tray area is spotless....probably just going to do new floors/rockers/quarter panels, and put a L28 in it with stock SU carbs and a 4 speed.
78 280Z. I just got this Saturday. It has a MSA header, Dynomax 2.5" exhaust, custom intake and MSD Blaster 2 coil. It also has new Bad Dog frame rails. I intend to build a ~11:1 CR L28E for this with a decent cam, and Z31 EFI.