Rebuild 5.7 or buy something else?

Let me start by saying that I am not an expert...but in reading many posts over the last 2 years the consensus seems to be...buy a late 80's early 90's 360 magnum engine with roller rockers and you are way ahead of he game. I am not sure what a 'drive by wire' or what wiring harness you are referring to, but 2 grand for them seems excessive. For 2 grand you can buy a whole parts car and take most of what you need and sell the rest to recoup your money. Also, don't give up hope. You will get more responses.