1966 Barracuda headers, fenderwall or not?

Ok, so I'm in the process of wrapping up all the body work on my car, it has been stripped down and we have finished 90% of the body work and it is going into primer in a few weeks. The last bit of fabrication/repair we have is that the original owner of replacement body (long story there) had cut huge holes in the fenderwalls for headers. I had originally bought a set of spitfire headers, but since I am now keeping the powersteering, I've learned that these will not work. I am putting a mildly built 318 with 727 transmission and 8 3/4 rear end. My question is, should I leave those holes and run fenderwall headers (if so does anyone have a good part # or information on which headers) or should I patch those and run the more classic under the chassis headers (also any part # or info would be appreciated)?

I just don't want to spend the time welding in the patch panels only to find out that I'm going to end up cutting holes there for headers in the future.

Also a side note, is there any way to modify the spitfires to work with power steering? If not, I have a set for sale...

The saga continues...