The cliff's notes version...
From 1957-1958, this is how it breaks down:
Plaza... Entry Level, Available in Sedan and Club Sedan (2 door post) Models.
Savoy... Mid-Level, available as a hardtop (2 or 4 door) or sedan (2 or 4 door).
Belvedere... Top Level, available in same body arrangements as the Savoy, plus a convertible was offered.
Suburban.. Wagon Models, 2 or 4 door versions.
Fury... Limited Production, 2 door hardtop only, only one color available (white, gold trim for 57, Buckskin Beige with gold trim for '58.)
The Fury was only offered with a V8, the 318 in '57-58, in addition to the "Golden Commando" 350 cu.i. V8 in 1958.
The key here is that in those days, all four models were basically the same shell, differing by hard top/ sedan, and two or four doors, but they were basically one series of cars with varying trim, engine, and option levels.