Would I be ahead in parting out, or selling whole?

Why not advertise it for $1200 and take $1000?

I'd not pull the engine and expect to get anywhere near what an engine would bring that you can hear run and drive.

Rule of thumb is..."if you can't hear it run, assume it needs rebuilt".

There's been pulled 5.9's around here sitting on CL for months at $375.
I doubt that's complete with comp, though, but still.