66 and 67 shared the same body but the front end is 67 only, the clip may have been changed out at one time, at vin check would be the best way to tell. If he is going by the build date code on the door pillar sticker, it may be listed as a late 66 build making it a 67.

Looks like a nice truck by the pics, not much on trans function but a bad/stuck governer can also cause it not to shift into third. Regardless if it runs good and appears to be in as good of shape as it looks, even if it needs a full trans overhaul, that is a good price.

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Paul