Engine Colors

[Ben M-P]

We are getting ready to install the engine (it is on a pallet at the moment) and once the mechanic has gone through it we are planning on cleaning and painting it.
Which brings me to my question:

What color would you recommend painting it?

(I like black but it occurs to me that finding leaks could be hard to spot until it hits the bilge paint. My wife like red so that it will look like the innards of a giant fish.) It is grey over red at the moment.