Venom wrote: Learn lots, save money and a much better chance of still liking your car at the end.
As if you didn't like your L after the conversion! You just didn't have the sentimental value towards your L like I do - which can be a BAD thing!
As for what you're uncle's said: The crossbred conversion does need some drive shaft mods - as does the gearbox change (25 splines on the output stub of the EJ gearbox, 23 on the EA gearbox), either way the drive shafts have to come out if you do the gearbox conversion with the engine at the same time. I would strongly look at doing the brakes first, then go up to the engine/gearbox combination. This way you've covered the braking issue first thus making your brumby safer on the road when its got the bigger engine in.
You will need the ECU and wiring loom to run the engine in the brumby. When I did my conversion I tried to keep everything tidy - venom can vouch for this as his wiring was routed through the engine bay near the firewall where as mine runs down the side guard and pokes into the engine bay relatively neatly.
I don't see why your brake lines will need to be changed - with the crossbred kit I'm pretty sure (not having done it myself) that the brake lines stay the same in the subi, just the master cylinder and the flexible hose to the calipers change - both are relatively easy to do.
You will have room for the AC gear. The trick will be having the hoses made up to mate the EJ AC compressor to the brumby's factory AC pipework. You don't need to tell the ECU that the AC is on as it will adjust its idle without an issue. The factory AC wiring will take care of the thermo fans unless you re-route the wiring to the ECU to trigger the thermo fans. That said a simple setup can have the ECU and the factory wiring trigger the thermo fans to operate.
As for doubling your work doing the gearbox and brakes first: You'll be creating some work trying to sort out the clutch setup for the EJ gearbox to the EA engine. The rest has to be done anyway so no real doubling up on the work - just a second visit to the shed... The EJ would bolt straight up to the gearbox if you managed to fit it first. It could be easier for you to focus on one aspect of this build at a time if you're learning along the way.
And take what venom's said - he's done the "pay someone else" conversion and knows how it feels to shell out the money and have aspects of the conversion done in a way that you would have done differently. I think he wishes he'd done it himself - but not having a shed is an issue (that I'm dealing with at the moment)
Cheers
Bennie