Big Block Swap

Welcome to the site.
At the bare minimum, you will need custom engine mounts, a big block transmission, exhaust from the heads down, engine harness wiring modifications, a C-Body oil pan and pickup, and you will have to probably need to shorten the drive shaft.
This isn't an easy or cheap swap unless you have all of the parts to do it and are a fairly decent mechanic.
It would be nice if you were more detailed on what you already have and what you expect from the car.
Pictures would be nice as well.

There are a lot of threads on here about this swap, so I suggest you do some reading as well.

Good luck, and keep us informed on how it turns out.........