[Daves55Sedan]

There is absolutely nothing unusual about finding a '55 Ford pickup with a later Y-block engine in it.
These came from the factory with the 239 Y-block truck engine which fell out of service from the crate engine rebuilders decades ago.
In 1981, a mechanic at a Ford dealer in Texas told me that all old 239 and 272 Y-block cores were being scrapped by the crate motor rebuilders and replaced with 292 truck engines with steel crank.
Anyway, I wanted to see engine pics because of the carb. You have a '57 or later intake manifold and carb, but it doesn't make a difference since the FBO allegedly connects to manifold vacuum.
I guess that means you could use the FBO dizzy with the older style manifold ('56 and older) and bug-sprayer type carb (Holley 2110, Holley 2100 and Ford EBU).