I also said that I got the engine loom and ecu with the motor and gearbox it was all one set and still together untouched
It may bolt in, and you may have the engine loom and ECU, but electronically it's not a plug and play deal. The ECUs are coded to the modules in the cars they came from, so unless you have a scan tool capable enough of recoding everything you're gonna have a bad time. It's also highly unlikely the LFX ECU will work with the BCM in a Series 1 VE without some kind of no-VATS change to the ECU. Electronically the Series 2 VEs that had the LFX/LLT are vastly different to the Series 1 VEs, down to the wiring in the looms, so you might even find that a lot of the looms don't fit together.
Basically, you're not going to be able to plop the engine/loom/ECU in and expect it to work, the fuel lines are the least of your problems with this.
Also, 3 litre is definitely not an LLT or an LE0 (LE0 and LY7 engined cars are also no better for this anyway), none of which came in a 3 litre, it's going to be an LF1.
The reason the LLT to LFX swap (which your swap is not) is so straight forward is that they are basically the same engine with the LFX having some very minor differences and integrated exhaust manifolds, and they also use the same gearbox. Because they are so similar, you just use the cars existing loom/ECU/gearbox and some other small accessories from the LLT (cats, injectors etc...) and don't have to deal with any change in electronics because there is so little of a change in the physical engine (design, displacement, injection) and its engine management.
Apart from the LFX to LLT, largely any conversion to a different factory engine in a VE, from a Commodore or not, is going to be a pain for the average person to do at home. The know how for these types of jobs that require specific modules and specialist scan tools and settings just isn't out there, so many shops won't do it for you either - so far I'm only aware of one in Queensland that might attempt something like this.
