Steve ke36panelvan

hey guys, I recently bought a ke36 panelvan to drive as a daily when i finally get my license back next month, it runs well but i wouldn't mind a little bit more power. One of my mates has a ke70 wagon and is about to get started on a 4age conversion so I'm thinkming about giving him a hundred bucks or so for his 4k motor and everything i need for the conversion. I realise the 1.3 litre isnt going to give me a hell of a lot more power but it will certainly go a bit better than the old 3k and i can't afford a conversion that will require a shitload of expensive changes to the ke. therefore, my question is: How hard will the 4k conversion be and what modifications will be needed to complete the swap? any help/advice would be greatly appreciated as i'm pretty new at this, cheers, steve