i've got one
mounting is same as s13, use the mounts it comes with or get some nismo CA ones, you can use KA but it sits different. I had issue with collar at end of transmission rubbing driveshaft and sparking through my shifter area but that was easy to fix, and I'm not sure if it's cause s14 or cause I had to get a bellhousing from junkyard and attach KA transmission (mine came auto).
Wiring will be your most difficult issue I would say. Theres very good documentation here
http://www.skylineking.com/fsm...4.pdf
That should get you through everything wiring wise. Goodluck