i don't think that Z32 would be that sluggish, they are heavy...but the VG accounts for a substantial amount of thier wieght. i think that SR20 is a definate upgrade from the VG30DE...
here are some weights i got off of some other web sites.
stock N/A Z32 = 3200lbs.
VG30DE w/ tranny=475lbs.
SR20DET W/Tranny=328lbs
so the Z32 above would come in with a weight of around 3053lbs, which is still on the heavy side... but with a few bolt ons it would make quite a nice power to weight ratio...
on3go, i have seen a few pics of that white z32, it's definetly bad ass...