IF you're starting out witha n 87 Turbo, don't ever put an SR into it. Kouki Z31 Turbos are VERY rare to begin with, don't ever slaughter one by putting such a horrible engine in for the chassis.
The VG can make more power than the chassis can handle, trust me on this one. Give me a call or PM me if you want to talk VG and go fast. I'm Mattback off Z31.COM and my Z ran 12.7 with minimal mods. (pump gas only, too)
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Advocate for the People's Republic of Awesome
rest in peace tim.