Timing mark almost 180° off?

Hi all, I'm trying to figure something out here, car never run great and I decided to check the timing (73 challenger 318 standard).
For what I remember the timing mark are on the driver side, kind of pointing towards the battery.

Well, this car has no timing reference on the block but the mark is on the other side, as picture.
Shouldn't it be on the other side? Car starts and run as normal.
Before I decide to go 180° on the distributor I would like to hear some thoughts. And the...

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Author: DToro