GSX-style modifications were carried out by the seller after acquiring the Skylark in 2023, using components said to have come from a GSX donor car. The 455ci V8 is said to be assembled to “Stage 2” specifications and is paired with a modified, switch-pitch TH400 automatic transmission and a 10-bolt limited-slip rear axle with 3.42:1 gears. The seller notes that a tune-up service is required, and the hood-mounted tachometer works intermittently.