Can the harmonic balance come loose?

Well... what's broke is kind of a mute point right now. It needs a rebuild, that I know.
I am curious as to how because I obviously don't want this to happen again.

Now I have big decision to make.

I need a stroker crank, bearings, and I like to get decent heads, and a rebuild gasket set.

Can anyone give me a heads up on where to look and prices?

Thanks guys, I appreciate your support!