It seems pretty close. My Z31 300ZX Turbo has a top speed of about 151 MPH, and with my specs
3.7 rear end
6000 RPM redline
225/50R16 tires
.8378 final drive
151.33 MPH top speed.
Wikipedia says the Shiro special was capable of 153 with no limiter, so this is pretty accurate. Most people's top speeds have been around 135-140 but their engines are far from new.