I have a K-Code engine ... in an original non-K coded car. Bought my first car in 1982. An early 1967 Vintage Burgundy Mustang Fastback. It's a C-code. The PO had a somewhat built up 289 in it. Barely a year into ownership, it lost it's air cleaner hold down stud down the carb and it landed on a piston and cracked the cyliner wall. Well, that was that! Had an opportunity to buy a low mile 1965 K-code complete with all its accessories and swapped it in. Never looked back. Great engine that made a great car even greater!