Swapping intake manifold.... Headaches

[Uncle Charlie]

G'day guys im in the process of fitting new engine to my 99 legacy GT wagon.
I have discovered that the harness under intake manifold is slightly different. Different sensors. Throttle body and injectors are different.
What I would like to know , Is there an easier way to reinstall intake manifold. .?
Also , the fuel lines run under the manifold. Is this able to be changed or would it be asking for trouble to mess with this. If I Change it to a fuel rail , does this change where the lines run?
Thanks in advance.
Dave

[r3v_v3ng3]

Where are you located? Not sure if this is for us or japan engine. Whats the engine code was on the car and the replacement? Also what year. We can help you better if you give more info

[Uncle Charlie]

Im in Australia, but it is a Japanese model , what they call here a personal import.
The original is a 99 GT VDC A899539
new engine supposed to be from an jap import B3264326 and I was told 99
Are these the identifying numbers you need.
Thanks