I have a 65 Fastback with manual trans (toploader) and power steering with a KRC pump. I am looking for a set of headers that will fit with out doing to much modification. The Exhaust system is going to be completely redone by an exhaust shop once the headers are installed, looking for suggestions here also (x-pipe or H-pipe?). I was thinking of Tri-y or JBA shorties, but I'm open to other suggestions.

What headers do you have and what is your set up?

 

I emailed Tony Branda Performance Shelby and Mustang parts to ask him the same question that you're asking, when I hear back from him, I'll post his reply.

 

Ok, I got a reply from them, He said it would be better if you use a Hi-Po Zbar! But he never said why, clearence issue I would assume.