Noticed a hefty oil puddle on the ground after letting my car sit. I also have the "lifter tick of death" so ive heard i need new oil pump seals. Can bad seals from the oil pump cause that bad of a leak? Also i am going to do oil pan gasket and valve cover gaskets.

If the headgaskets have never been replaced, it's possible the oil channel that goes from the block through the head to the cam tower is leaking. All of my original EA82s developed that leak a long time ago. Other common leaks - camshaft seals, and the o rings on the little pieces they are pressed into. Rocker cover seals. Front or rear main can leak, but I haven't seen that to be common. Oil pump o rings and seal. You have to clean everything well, and I've heard of fluorescent dye you can use to trace it. If your engine is all original, it probably needs all of them, or will soon.

Replace the oil pressure sensor while at it.