nissan 300xz turbo
A little more info would be helpful; what are you thinking to do?? Basically if you what to do a swap it will be engine,transmission, all the wiring, ecm/computer.....etc..better off to buy a different vehicle unless you are a very talented technician....otherwise this is a very long and expensive project.
assuming the automatic was the same or near in year yes if you only swap the engines
no 84 and 85 swap out.
Vvl swap
There are a few different motors that can swap in with some mods and wiring. you already have the ka24de in it. You can swap in The sr20det or if you have alot of money i would spring for the rb20 25 or 26. the Nissan skyline motor. it requires alot of wiring to work. I've even seen one person put a v8 into a 91 s13. you can also fit a ca18det which was in the early 240s in japan it is a fairly cheap motor and swap is you have a first gen. http://en.wikipedia.org/wiki/Nissan_240SX this site will tell you everything about the motors what will swap in etc
Check the crank position sensor
Yes. How easily this swap will be depends on what the engines are.... if you're replacing, say, a 4.3 V6 with a big block engine, there'll be a lot more work to be done than if you were trading engines of equal displacement.
Yes many people swap engines in RC Cars. This can be done. This site teaches you how to replace the engine in your RC Car : http://www.rccaraction.com/
4g63,4g93,4g92,6g72 and a couple more
Yes
trade, bandy, truck