5.2 and 5.9 are physically the same size, however they are balanced differently. 318 being internally and the 5.9 externally. So when you get the motor just make sure it comes with the flywheel. And also note that the flywheel pattern was changed in 95.
Wiring harness wil work fine, you will have to tap for two more injectors, which your V8 computer, which you do require, is already ecuipt with.
NV3500 is notorious for breaking under power, that is why it was never offered behind the 360. But, a rebuilt one will work for you. There is no perfomance upgrade offered for it unfortunatly. so why not just up to the NV4500? the gearing sucks!
So basically anywhere that a 318 will fit, so will a 360, but they do need some changes between the two.
And BTW, the 4.7 uses a completly different computer system and require you the rewire almost all of your existing wiring. not very economical, and then you are stuck with a motor that is good, but as of yet hs very little in the way of performance backing.
Shameless plug time, I do have a complete freshly rebuilt 318 for sale. Just broken in.