Any 020 will bolt right up transmission wise, so you can re-use the tranny from your 1.6.
Pumps are very very similar and tuning them fuel wise is pretty much the same(once you pilfer the pin from your 1.6 pump).
As for wiring every AZZ swap I've done I have ripped off the AZZ wiring loom and used all the 1.6 wiring.
Clutch whise you might want to ugrade to a 16v pressure plate and make sure your disc is good, I personally went through a pair of stock clutches on my AZZ last summer at 20psi and strong fueling, so an upgrade would be suggested with the power you're looking to make. I am going 6 puck and heavy duty pressure plate but thats overkill.
All in all your looking at the easiest motor swap out there, so just take your time and make sure everything is tight and have fun.
1SlowVW