New to forum after a bit of advice

I have a VW T25 1.7 diesel . Ok so its a big sluggish and its done over 150k but I have my mums 1997 Suburu 2.0l automatic petrol sat on my drive as it had a slight rear end bump last month and got wrote off so we are scrapping it.. Although suburu does drive fine just a coolant pipe leaking so have to top water up every 10 miles!

I've had a look on net about suburu engine conversions (I am a woman and I speak for myself only, that woman and engines do not mix!) but I just want to know if any one has done it ? is it a major job? How much should I be expecting to pay someone to do it?
Am in catch 22

ANY help or any thought / tips etc greatly appreciated.
Thank you !

