VG30DET? Single turbo? I thought it would have been a twin set up like the 300ZX.
You must've been a resident in Japan for a long time. My mates went for a month in search for some live JDM action but all they could find were Kei class people movers.
The Fairlady has alot of potential. I've seen some really slick looking examples. At this stage in its life you'd have to replace almost everything so all avanues are open to you. LS1 conversions are very popular and yield a very impressive result, but have you considered something in the Nissan family, say maybe an RB26DETT or if you're more keen on overall performance a boosted SR20DET. Those motors are built pretty tough and there are an abundance of SR's, here anyway...
Haven't done my research on the LS1's but I know they're big, heavy maybe.
Thanks for sharing