Help With 67 c10 Information

[NewRevNorton]

We have just purchased a 1967 c10 to restore and have discovered some pretty wild information about its unique build. The truck appears to be completely factory and untouched. This truck is a factory power steering, power brakes, front disc brakes, air conditioned custom cab truck. Where the cunfusion begins is with the lug pattern. It is a five lug truck. This seemed rare to me because most, if not all, I have paid attention to were 6 lug. The next thing that is very unique is the door panel design. It has a floral like inlay in the doorpanels which I have never seen before. And the final thing that is confusing about the truck is the engine. The casting number that we can find on the engine are just above the bell housing on the block. The casting is 3970010 which would indicate that it is a 327 or 350. But the info that I have seen about these trucks is that they were not offered with a 327 engine until 68. I cannot see any casting numbers on the front passenger side of the block which leads me to believe it is a pre-1970 block. And as I said before, it looks very original and untouched inside and out so I was curious to know if there was any possibility of the 327 option being special ordered in 1967 and any addition info about the other options on this beautiful truck. Check out the photos attached.
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