Swapping big blocks

I currently have a 400 siting in my 69 dart with a small block k frame and Schumacher adaptors. I have a buddy selling a running 413 for cheap. My 400 is currently disassembled waiting for me to pick the right parts. My thought was to buy the 413 and install that while I finish building my 400. My question is will the scattershield, exhaust and motor mounts all work or will they have to be changed being the 413 is a RB. Thanks!
If the 413 came from a 62-65 passenger car, then it will work, if it's a pre-62 or from a truck or motor home, pass.