'65 C20:
PO bolted a stereo from a popular asian car to the bottom of the dash and cut speaker holes in the doors.
Replaced original 4-speed with a Muncie box.
The door weather strips were replaced -- they put the left weatherstrip on the right, and the right weather strip on the left.
Cheesy headers and bailing wire exhaust hangers.
Other than that, not too "Customized." At least they kept the original 292 and didn't drop a V-8 in it.