Sos!!!!!

[Ssj Silent]

hey all im new to this and few reasons why i joined
A MAJOR FORD fan
B own an au falcon

but anyways to the real point for my sos call!!!
my au falcon dont get me wrong is awsome much quicker and named a "sleeper" by friends, however being only a standard motor 157 kw's the lifters are starting to die. what i really need help with is a motor change
im being offered a au xr6 VCT motor with computer for $600 with around 120,000k's my main questions are
Do i need the computer?
Do i need the wiring harness? etc...
is there anything else i will need?

to help with the answer
my car is. 2001 au II s pac manual 5spd with standard motor with 270,000k's
current mods
2 1/2 inch sports exaust
high flow cat
pacemaker extractors
anger induction kid
k&n high flow flat pannel filter
power turbine fitted after filter
so my power is much higher than 157kws

i dont know if those details would help but im looking at the motor this friday and really need help as some people have said i need all, being the computer and wiring harness some have said no

help would be much appreciated and if you would rather direct respond
ricky_nitro_xwow@hotmail.com
thanks
Rick