[peterpjb]

as I learned, in late summer 1964 the Ford 289 engine codes changed from C4AE 6015 to C5AE 6015, which means from a five bolt to a six bolt block,

round about 100 cobras until csx 2589 were shipped to Shelby American in late summer 1964 until end of 1964 and many of them weren't invoiced before February 1965 or even later

were these late 289 cobras equipped with C4 or C5 engines ?