Mastershake, here is a thread you might want to check out. For the record, I have been studying 340's intensively for several years looking for such details. I have yet to see a single 100% original example of a 68-71 era small block fuel pump with any paint what so ever. It's become evident that they were either masked off very well or installed after paint.

Bell housing coverage did vary, but as mentioned, most got partial coverage with a fair amount of bare aluminum showing towards the rear. They weren't the target of the painted, they were just in the way and got over spray on them.

340 Thread