2jz swap...wiring Q???...

[*D-Joker*]

ok so i, like alot of ppl am contemplating doing the 2jz conversion into my mkIII...
and i have been doin some research but there is some thing that gets me everytime
...alot of ppl that make the wiring threads for the conversion barely mention anythin about the ecu, and the couple of threads that have mention usuing the 7m computer...
and a couple of threads i have read they mention it as a major pain "splicing" the 2j loom and the 7m loom together

so i guess my questions are...
why would ppl use the 7m computer instead of the 2jz 1?...is there a problem in using the 2jz computer?
...and why is the loom splicing so hard?

...i know there was a detailed thread on how to splice the 2 looms together but i cant find it.

so if any1 can answer my questions or show me where the threads are that explain this to me, it would b much appreciated

thanks in advance =]