273 commando heads

I need help to do a positive ID on a set of heads I purchased. The seller said these heads came off of a 66 which I believe to be true based off the casting dates. My question comes on the casting #2658920-1. The chart suggests they are for a 67 but the intake valves are 1.785D6E07AD-5C7D-4329-B099-36C7CDFE8225.jpegED2745C6-B909-4DBF-B9F2-71D0869F44B2.jpegEDA31597-FF7D-4C93-AD86-6A54C3153E42.jpeg7C07CBE3-BE1F-4D0F-8EEB-887C581E08A2.jpeg2A863E09-A120-475E-9DE4-7AD440A26A3D.png