Mk1 engine swap

Hi
I'm thinking of trying to swap engines in my 1982 mk1 carbio 
I can get my hands on a mk3 8v 2.0ltr gti engine quite cheap with just over 60k miles on it genuine 

I am wanting to do this mostly on my own 
I have a good friend who is a mechanic if I get stuck with anything

Is It possible to do it without spending a fortune 
What would I have to change 
And what would I get for my engine it's got 72k genuine miles and runs spot on

Still not sure if I will do this yet 

Thanks in advance 

Info on engine swop here but Mk3 engine a straight forward swop if you have a 1.6 or 1.8 engine in the car already as you can use your original engine mounts.
Engine Conversions - The Mk1 Golf Owners Club

What engine is in your car?
How are you going to fuel the engine, fuel injection or carbs?
If your car is already fuel injection you will have the fuel lines and pump already to run fuel injection, if not you will need to change them to GTi stuff.