IF you want to be running it quite soon, yes, the billet link will help hold it together. If you are on a tight budget, add the link, and get the flywheel. The flywheel is not only a good bang for the buck performance part, it's also safer. We ran one in that form for almost 2 years when we started. The rest can come later as money allows. Clean up the ports a bit while the head is off wont hurt, and it's free. Just time, and some sandpaper.
Just keep in mind, it can still blow up. Any of them can, even the billet internal ones.