I have a 71 Mustang with heidts frontend installed so I have decent engine bay room. I guess what I am curious about is if anyone has a simliar early Mustang with TFS A460 heads that they have found an off the shelf GM header that fits. Or fits with modifications. Looking through various posts, I have seen some use of Chevelle big block headers for certain cars. I just prefer not to play the guessing game with summit orders if someone actually knows. Ground clearance is somewhat of a factor for me as this is a street car. Just makes my life much simpler if I can buy them as opposed to building a set. And would a mild compression 514 inch engine do better with 2 1/8 or 2 1/4 primaries? Thanks for any help here.