That is a Series 2 R33 motor
Not a NEO RB25, so unfortunatley you have been stung there
In the top picture, The far left circled plugs look like they are for the coolant temp sensors, a cant see what the other ones are if you get some close up pics I can go check my series 1 loom in the garage
But I dont have a skyline anymore so cant be all that much help
The easiest option would be to drop the motor in. the Ceff Engine bay is similar to the skyline one, once you have done that run the part of the loom with the MAF plug up the left side (drivers side in your case) then you can start to see where everything goes, and most plugs are all individual, so you cant plug the wrong thing in