If it was 2+0 and 5 speed I think it would be worth about $4000. It appears appears to be pretty clean, but even concourse hagerty only has them at 10.5K.
I did find this comment interesting: "Intercooled, turbocharged models debuted in the States in 1985, while the turbocharged Shiro Special debuted in 1988."
I've never seen a factory stock intercooled Z31 before? Maybe outside the US?