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Ok so looking at the picture the fuel rail / manifold and the air intake I presume that is the name for the part which the airfilter is attached to. Would be sold together?
Not necessarily, it is a throttle body. The four bolts on the inlet manifold can accept several different types of Nissan throttle bodies.
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I have been trying to work out how both of these parts work together I understand the fuel rail part but I dont really understand where the air intake would mount upto on the engine?
The air intake, or throttle body and air filter are the beginning of the induction system, when you press the accelerator pedal the throttle valve located inside the throttle body opens up to allow more air in. They are typically located in the front left corner of the engine bay.
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With the pulley wheel should that just spin freely?
Yes it should.
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because this one doesant it mooves and then locks up then you spin it the other way and its the same so I am not sure if one of the drive gears are locking
Has something fallen into the inlet or the outlet. If it moves then locks up there could be something jamming it up, proceed with care.
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I have been trying to work out what does what on the SC, now I know that the pulley from the SC connects onto a the crank pulley of the engine to generate the compressed are. So I take it that I would need to change the crank pulley on the engine to allow another belt?
Yes, there are many types of a-series crank pulleys and a handful of those are multi groove units to run multiple belts.
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Lastly can I run the SC with my webber carby? I have read that it would be better to run with the fuel rail but I would prefer to run it without the fuel injection?
You can but the current setup is quite smart with the fuel participating in only the last segment of the circuit after all of the major volumes. If you put a weber as draw through and then plumb in the inter cooler you will run a very dangerous setup and it is not recommended. If the carby is set up as a blow through you should be fine to run a cooler.
Hope that helps a bit.