* Small-block V8s: These included a 350 cubic inch (5.7L) and a 400 cubic inch (6.6L) engine. These were the most prevalent.
* Large-block V8s: A 454 cubic inch (7.4L) was also available, though less common.
It's impossible to say definitively which engine was in *a* particular 1974 Caprice without more information about that specific car.