not unless he swapped it- the '80 was only available w/ a 305 (5.0)chevy, a 301(4.9) pontiac, or 301(4.9) turbo. '79 was the last year for the 400 pontiac and 403 olds.
My bad. You think I'd know that since I've had a W-code '80 T/A, a Y-code '79 Esprit, and an R-code '77...
2011 Mustang GT 5.0 6-speed, 3.55 rear, and Brembo package