I got to meet (virtually not physically) a fella who breaks Passats, he can basically send you everything thats under the bonnet on a pallet for an extra £50. The cars he does have arnt the lowest milage cars but they have been serviced and maintained, and I dont believe any of the scrap car dealers that say the engines have 70,000 and you just have their honorable word for that. If you want an AFN fitted with the AFN manifold its going to need some custom built stuff like engine bars, custom exhaust etc and if you want the battery keeping in the back that is going to need custom attention. You will need a upgraded clutch and a modified fly wheel from a 1z Golf, and your OK for a charge and oil cooler. If you want to run the AFN belt set up with the advantage of the much bugger alternator you would have to keep the power steering pump going so a reservoir of power steering fluid would have to be set up on some kind of loop I suppose or custom fit your pump to that engine (more money).
The tricky bit is the loom, you need to take a loom out of the car (it can take hours) and trust someone to do a good job of custom changing it and the ECU will need re mapping or the immobilizer chip that is in the cars key put into the loom so it can start using your key. This is something I didnt want in my loom so the ECU went off for re mapping and he immobilizer done away with so I can fit my own that I can manipulate to my advantage

.
As far as engines go I was told to find a Passat or an Audi A4 (some of the others have different mounting points?), I found the Audi Redeye/Redline or sumfink to have the AFN engine but they are quite hi spec and you dont see to many of the engines around compared to the Passat, but on a good note the ones you see can have 280,000 miles on them and still going so if you can find a Passat engine with 130,000 or less you should be rockin
If you go for the 1Z or the AHU there seem to be more of them around with lower miles for less.
Thats how I understand it anyway
jed