I need some opinions....

Ok I was talking to one of my friends who owns his own body shop and we were talking about my car and makeing it faster ... I mentioned to him that I wanted to put a turbo in it ... he looked at me and said it would be much easier and cheaper to just buy a new engine ... So hear is what I need an opinion on would it be cheaper to just put a v8 in my car and do all the work myself or to put a turbo ????? Thank you for your insite .....