Do the Gotoh GB640 L4 Nickel tuners come with bushings and screws included, or do they require separate hardware purchase for installation on a Fender Jazz Bass neck?

Yes, the Gotoh GB640 L4 Nickel tuners include both bushings and mounting screws, so you won't need to purchase any extra hardware for installation on your Fender Jazz Bass neck.

Are the Gotoh GB640 L4 Nickel tuners a direct replacement for vintage-style Fender basses with reverse-wind machines, or will any additional reaming or drilling be required for installation?

The Gotoh GB640 L4 Nickel tuners are designed as direct replacements for vintage-style Fender basses with reverse-wind tuners. They fit standard 11/16" (18mm) tuner holes, so no additional reaming or drilling is usually required for most vintage Fender basses. However, it's always best to double-check your bass's tuner hole size and screw hole alignment to ensure a perfect fit.

Is the Gotoh GB640 L4 Nickel a direct drop-in replacement for vintage Fender basses with reverse-wind tuners, or will any modification to the headstock or screw holes be required?

The Gotoh GB640 L4 Nickel is designed as a lightweight, vintage-style tuner and is a popular upgrade for Fender basses with reverse-wind tuners. However, while it closely matches vintage Fender dimensions, minor modifications to the screw holes may be needed for a perfect fit, as the mounting hole positions can differ slightly from original vintage tuners. Always compare the provided mounting template with your bass before installation. (Source: Allparts, Gotoh official documentation)

Is the finish on the Valencia VC103K Natural prone to showing fingerprints or smudges, and does it require any special care compared to other finishes in the Valencia line?

The Valencia VC103K Natural features a satin finish, which is generally less prone to showing fingerprints and smudges compared to high-gloss finishes. It does not require any special care beyond regular dusting and occasional wiping with a soft, dry cloth. This is similar to other satin-finished guitars in the Valencia line, making maintenance easy and straightforward.