Ideas on what's causing my click/tick/rattle noise?

I would take a close look at the rings/ring lands. If it was detonating that bad, you might have a problem there. I have lost a couple of piston/rings, from detonation, but the rods bearing were still fine.

The pistons, rings, and lands are all good and have been cleaned up. The block got a quick kiss with the hone and we are one step closer to assemly.