They might end up in a strange angle. But should work. Are you using single or twin turbos.
Alot of times it easier to buy block hunger style headers and just bring the pipes forward in stead of back. Not sure what the goal is and how much hp you are looking to get in the end. Big blocks need to breath if you use bad manifolds and Tight piping you may have trouble with heat soaking and poor combustion leading to detonation. Its also usally easier to mount the turbos down lower on a street car as you can get top mounts for accessories. Leaving lots of room for some big turbos.