Do you paint your engines fully assembled?

My 360 is apart now. When I'm finished working on it I will paint it. It got me thinking. Do you guys and gals like to paint it fully assembled or do you paint some of the parts separate? It's gonna be blue with aluminum intake and mopar performance valve covers. I think I'll do the pulleys black so those go separately. Just curious how you like to do it. I'm not sure I want to paint all the bolts blue because when you then work on it later the paint come of anyway etc.