vvel issues

[Tedmeister]

So I replaced the engine wiring harness, due to continuing electrical issues.
The mistake I made was plugging the connector meant for the throttle body
into the VVEL and vice versa. Car ran rough and would not rev past 3500 rpm and then drop to 3000rpm. Got code 0011. Took it to Nissan and was told by one mechanic who just got back from Nissan tech school that something inside the VVEL was damaged and the only way to fix it is to purchase a new head from Nissan with the VVEL attached, because the torque specs are so precise that they will not allow mechanics to change them out. I would just put another used engine in the car, before I would do that. From anyones experience can I replace the VVEL? I cannot believe that Nissan would use all different connectors and then use the same ones that if reversed can do such damage.