An S30 isn't a project to be undertaken lightly. NOTHING is cheap on a Z restoration.
The 411 seller? Clueless.
Dash is shagged - Where do you think you'll find a clean, intact 411 dash?
Windshield? Good luck finding one.
Rust? I would bet a month's pay that's NOT the "only rust". That's some BAD cancer.
Steering wheel? Hard to find.
Bumpers? Good luck.
Grille? I have an extra. $500 and it's yours.

Rear taillights? I have 2 spare ones, I'd sell 'em for $500 each.

Seller has no idea what kind of carb is on the car.
No title? Red flag.
$350 to do "paperwork"? What kind of "paperwork"? Applying for an abandoned title costs $40 in AZ. SMH
Good rule for project cars: Buy the BEST EXAMPLE you can afford. Tried-and-true.