jpp, FYI, this is known as a thread Hijack, please start your own thread on this topic, lots of knowlagable folks here that would be happy to help. I can't answer your question, as I have never smoked heart, but I think some have.
As far as the Little Chief goes, I would pass if he plans on smoking anything besides jerky, or fish. I smoked a turkey on mine once, and finished it in the oven, it was okay. I would tell him to pass.