A marquee car for Buick was its Special, considered an entry-level vehicle. This lovely 1958 model is the last year the Special was made. In the 1959 model year, the LeSabre was to replace the Special.
The engine is a 364 cubic inch nailhead V8. It has an automatic transmission.
I was wondering what the function of these steel antennae behind the rear wheel was, and have to conclude that they were there to help with parallel parking. If you hear metal scraping the curb, you're too close. A single antennae is also found behind the front passenger wheel.