Oddities sometimes abound. I used to have a friend that had a concours 1965 "K" code GT. His car was factory correct with the standard exhaust manifolds on his HiPo. Seems the line was out of the HiPo manifolds the day his was being assembled. Ford would not hold the line for such a detail and his engine was assembled with the standard manifolds. Now I never knew how he proved this, build sheets maybe.