Greetings and welcome to our TorqueCars forum
I only wish I had a pound coin for every time I saw a post like this
Trust me on this buddy, buy a car with the 1.4 already turbocharged. Firstly, if you go down this route then depending on you're age and postcode, the insurance premium will seem like a third world national debt. Secondly, if you use this car on a daily basis, have you factored in bus/train fare to get you into work while the car is off the road for the building works? If you intend on having the car for a long time, have you considered who will want to buy it off you when you are tired of it? Are you prepared for the colossal loss of money on the sale price compared to what you just emptied out you're bank account for to create?
I know it all sounds good in theory, buy a car change the engine and whack a ruddy great turbo on it; but there are costs and consequences that need to be taken into account which many of those embarking out in the car modifying game for the first time have absolutely no idea what they are letting themselves in for.
If you really really really want to do it and you have listened to what I have said - then I honestly wish you the very very best of luck
But and this is a big but, I would be failing you and myself if I did not point out a couple of serious pitfalls to you