not even the headers, shorties or otherwise. where the headers exit from the head they don't have a sharp turn down and they will hit the shock towers plus the driver side dump would be sharing room with the steering gear box, which not only prevents the headers from working it also precludes the use of the h-pipe.
if you had a 67-73 you "might" be able get away with it if you had a rack and pinion conversion but even then it's doubtful
FPA makes some, there is another company or two that makes Tri-Y's (do a search, can't remember the names) i believe the Mac headers for early mustangs will work with the P heads and you can also use your stock log style, Hi-Po 289 or 351w exhaust manifolds.