Small block keeps blowing the oil filter off?

I've heard the quality of the melling products can be iffy. Thanks for the tip. I got the pass header off, and the center link loose. Dropped the pan about 6", and just barely got the old pump, and pick up off. The pick up tube screen is clogged with crap. I'm getting a new screen, and pump tomorrow. The tune is melling part# 72-S2? The local Advance Auto is going to have it by 7 AM tomorrow. I'm hoping to snake it back in, and fire it back up sometime this weekend. I got this engine from another guy in trade, so I wonder what crap is in the passages that's in the pick up screen? Hope it's not spun bearing material.