Personally if it was me, I would keep those parts. If you don't need the $$$ and have the space.
If you sell your ride the original parts can go with the car.
I agree, however there are parts not worth saving. For example, fasteners, especially plastic ones, are typically one use items, as are rubber hoses in some cases. Picking and choosing the items is difficult!
I kept all the parts (excluding the one use stuff) in case either
A) I ever decide 815hp is too much for this old man
B) I ever decide to sell the car and someone kicks the tires and says "Welp, I would but it's not....(INSERT EXCUSE HERE)".