Thanks for the history lessons, very cool.
To confirm, according to Peter Sessler's "Ultimate American V8 Data Book", the Fireflite name was first used in '55 on cars with that model name. The displacement that year was 291. The engines were the same as each other again in '56 but bumped up to 330, the Adventurer that year was 341. In '57 all Hemis were 341, and the Firedome name was used on the 2 bbl., Fireflite was 4 bbl. The 325 w/polysperical heads was a one year addition to the Hemis in '57, it was called Firesweep . 1958 was the first year for the B-wedge head at 350, or 361 in the Adventurer and the Hemis were gone. Chrysler's name for the engine family in general at that time was Turboflash.
Boy, those marketing guys sure made it sound fun, not much of that these days.