B7 S4 AVANT
 

I found a B7 S4 Avant for 3000. it needs a engine but I found one for $500 with rs4 reinforced guides. This would be my first time doing a engine swap, I only ever done small things. I have buddy's that will help me and a heated garage and all the tools I need. I just wanted now what questions I should ask about the car/engine and is it worth it?