I did like the Exner styling. I believe that the Fury/Belvedere were a 2 or 4-dr hardtop and the Savoy/Plaza were 2 or 4-dr sedans/wagons.
The B-pillar did strengthen the body structure. Hardtop glass seals were also prone to wind noise/water leaks.
Note that 1955 and 56 Mopars; within the same division, were quite similar. 1957 ushered in the huge series of changes between the Torsion bar front suspension, ball joints, and first year of the 3 spd TorqueFlite tranny, etc.
they aren't better both have their strong points the 360s are just a lot cheaper to build, and I already have the 340 block. Mind you I have a built 360 with 340 race heads in my 72 and it's a great motor but definitely not better.
The cheapest I see nearby is a SW in Waco for $7900. You might look in junkyards that have vehicles that old. Craigslist hasn't been much of a site since they started charging $5 per car ad last year. Maybe Facebook marketplace will give you better results.