Slant six oil pump priming

What are we talkin about here? A completely assembled engine? One you are building? One you are going to build?

Here's how I do it on slants I build. With the engine assembled sans timing cover, timing chain and distributor, put oil in the pan. Drive the camshaft bolt with an air ratchet clockwise. It'll prime right up. You can rotate the crank carefully if necessary to get oil to the top. Once you get oil to the top, consider it primed.