1974 Plymouth Duster Restomod

I got to sanding the engine compartment for paint today, and it is going A LOT faster than I expected it to go. I am painting half of it tomorrow, I got everything removed sanded and prepped today for this side. And I will paint the other half when I am ready, but it should not take long I am 75% done with sanding the whole thing. I will post pictures tomorrow!

How did you sand it? What grit and how did you prep the surface? I might want to do this before I take it to get painted!