As others have said, if the engine is running, nothing is 180 degrees out of position, it's all pretty darn close. It might not be set up completely correctly, but it has to be close.

It's possible the front pulley was put on wrong.

On engines with a lot of use under their belt, i's common for oil sludge and crud to build up on the oil pump drive shaft underneath the hole in the block it rides in. This makes it very hard to extract. I wouldn't work at it too much - I was struggling with one once by grabbing pat of the lip that drives the dist with pliers and pulling (and rotating, don't forget it needs to rotate as it comes up). Eventually, it broke. D'oh!
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'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)