The original Datsun 1200 block had the alternator on the manifold side and the AC compressor on the same side. Newer blocks moved the alternator to the right side. All dealer setups had the compressor on the left side either high or low

Compressor can go on either side. See our tech article Compressor brackets. On the right side it goes above the oil pump


Here's one. Custom install on right-side, battery moved to trunk, compressor placed just above oil pump. Mounted like an alternator with no idler pulley -- it pivots to adjust the belt

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  RH AC compressor.jpg (42.61 KB)