All Small Six Part numbers and date codes

This relates to all small sixes
Would a 65 Mustang with a scheduled build date of 29 K (October 29,1964) have a part number on the block of C4 or C5? Mine has C5DE-6015. I can’t read the stamping above the draft tube, is that where the date code should be?

Head has a number cast in the back of the intake are of the casting that’s 3F18, which is June 18 1963? If I’m decoding the right number in the correct way means the heads been changed with one from 63?
 
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