First off, welcome to the forum and good luck in your search for a Z car. In our "FAQ" section, you'll find hundreds of excellent discussions on common issues, modifications and repairs on the Datsun/Nissan Z cars.
Without knowing the asking price, your mechanical abilities, and your ultimate plans for the car....here are a couple of things to look for:
- Inspect the floor pans topside and underside, the frame rails, the rocker panels, and the inner fenders for rust/damage/shoddy repairs/fiberglass/bondo. These are some of the areas most often rotted out and/or poorly repaired. If the car really has "all new metal", it should be apparent via inspection.
- Are you comfortable buying a built engine just based on listening to it run for a few minutes? If it smokes heavily, has significant clatter and/or rattle in the valvetrain; those are just a couple of signs that the internals are suffering. Visually inspect the oil, trans fluid, coolant, and brake fluid to ensure they all look clean, fresh, and uncontaminated.
The car looks neat from those couple of photos; but unfortunately, people often buy someone else's unused "toy" only to find that it doesn't live up to their expectations for one reason or another. Do as much research on old Z cars as possible before buying anything, to ensure that you don't fall into this trap.
Looking forward to you joining us as another proud and happy Z owner!