There are two distinct looks that I'm partial to,
The first is sort of a Pro Touring meets Oldskool, basically wide modern wheels, slammed suspension, clean body with minimal add-ons aside from some ZG flares, front lower airdam and shaved mouldings, keyholes, door handles, wing with flush signals. Chrome would be minimal, reserved for the bumpers, glass mouldings and the b-pillar Z emblems. Paint would be somthing period correct or subdued, white, pale blue or green with a complimentary colour such as gunmetal. Running gear would be all modern, LS1/T56 or RB26DETT. Suspension would comprise of full coilover setup, poly bushings, sways, braces.
Somthing like this, minus the fender mirrors and other items mentioned above, throw on some Volk GTN's in bronze and you've got a better picture of what I'm trying to describe.
The second theme would be period JDM. G-nose, ZG flares, headlight covers, 432R wing, fender mirrors and no other body mods. Again it would have to be slammed and wearing wide rubber, but on period Sakura's or Watts. Colour scheme would be two tone, again subdued colours that look 'right' on an oldskool Japanese sports car, butternut squash yellow over gunmetal would be gorgeous. Drivetrain in this case would be a worked carby L6.
This car is simply stunning,
IMO, of course.