That appears to be a 'mist jet' type compressor. Nissan didn't utilize that type until 1979. A 1973 would have had a 'swash plate' type compressor which would be visually distingushable by the side cover which the one in your video does not have.

I asked him about that, he said yeah its a 280zx comp, due to the low pressure of the original ( 1973 240k ), I put that to get more pressure

you are absolutely right, but if this car is for me , Ill keep the stock one ( original ) even if it is not working at all , and Ill use the car in winter only

cause I like the stock shape deaply

I've worked on both types and, actually, the earlier type that would be stock for a 1973 240K would work fine if properly rebuilt. It's basically the same unit used the non North American market early S30 and here beginning with the North American market 1974 260Z through the 1978 280Z. I never noticed much, if any difference between the two performance wise.

Edited October 3, 201212 yr by sblake01