So, when I said there was no end play in the crank earlier, I was wrong. I only pushed on the crank. Today I pushed & pulled and as it turns out the end play is actually something like
0.045 (0.045, NOT 0.0045).
Additionally, I took a closer look that I had previously & noticed something new. Does the picture below mean the rear main bearing is cracked/disintegrating? If that is the case, I assume that means I really should get the engine rebuilt?
Link to very high res version of the picture.