All of the Sprint engines have their blocks painted black from the factory, gloss or satin is acceptable (it depends what paint was in stock at the time) I always go for gloss as it looks better in my opinion.
Heads are raw aluminum as are inlet manifolds, gearboxes and adapter plates.
All of the original cam covers that I have are powder coated satin on the outside only, this includes my NOS one. It looks like the cover has been coated then placed on a mill to have the lettering faced removing the coat and leaving silver lettering. My NOS one has machining marks from this.
The exception are replacement BL gold seal engines which were completely sprayed gold, I don't know the shade though. Mahesh's car has this.
Dashpots were never polished!
Dove grey matches the original air box colour.