1. The black 'Cuda :
definately a big block ( header location tells this ), more than likely a stroked and bored 440 ci. The early "A" body 'Cudas came with either a " slant 6 " cyl. engine , or the V-8 models were of a 273 ci., or a 318 ci.,or the very rare 340 ci..In very , very , very rare circumstances , some of theses cars ( only a couple handfuls ) were released with the "B" big block ( 383 ci. ) , or the "RB" big block ( 440 ci. ),and in super,duper extremely rare cases , very few had the twin 4bbl "RB" 426 Hemi.The big block versions of these cars were generally sold to private racing teams or the factory backed guys,very few escaped the factory into the general publics hands though,not saying they are not out there ( beware of clones ) , but they are rare pieces.
2. The burnt orange colored 'Cuda :
definately a small block version , guessing a 340 ci, or a 360 ci. , this can be told by , again , by header location , going under car , not through wheelwell like a big block does , as far as telling a small block from a big block by looking at oil pan sump location (GOOD CALL CANO ON THE OIL PAN 👍), the "A" - "LA" version small blocks had a rear sump , hence the location of the sump part of the oilpan , if it were a "B" or "RB" big block , the sump location of the oil pan would be in the front of the engine.
More Mopar tidbits for you Bondy. Enjoy
CANO ,while wishing it was a Hemi (good thought), it's unlikely , due to the hood clearance issue with the early "A" body cars