This has never been a particularly high traffic board, five or six people is the most I've ever seen consistently post at one time. While there is the inevitable attrition that takes cars off the road there are still plenty in the hands of active enthusiasts. I don't know what the best board for Z31s is any more but I'm sure there is one.
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1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo
Warning: Objects in mirror aren't as fast as they thought they were.