Expect to need the wiring loom and gearbox, the ratios are different on these models. I think the engine mounts should fit ok if you source a Polo or Golf unit. The 1.6 is not a great engine, there are a lot of issues with coilpacks, carbon build up and not much power output.
What about fitting a newer 1.4 TFSi engine, you'll have much more power for a similar outlay?