I don't think the sensors would be TOO big of a problem. A few things that are important to note are.
THe NATS (security) system will need to be kept intact for the car to run (ECU, IMMU and key all from the same car or dealer will have to rerogram ecu)
The 350z trans does not have a speed sensor. the 350z gets it's speed signal from the ABS sensors.
The throttle is controled by wire not cable so you would need the gas pedal too.
I put a maxima motor in my car with a 350z trans (has a 350z oil pan now too).
Thaniel