Welcome to the Team!
You reuse the stock ones that are there already.
Unlike a Nova or a Camaro that was so small a car that a BBC wouldn't fit under the hood without moving parts of the car to fit around it, and moving the motor up and to the passenger side to clear what couldn't be moved, there is lots of room for a big block under the hood of a full size car.
What I question is why stop at 454, a BBC today needs to be bigger to make power with pump gas. A 496 is a good start.