Engine ID

[wxman1]

Have a 69 Chevy C10 P/U. I was told by the previous owner that the engine
was actually from a Monte Carlo. So I went looking for the engine ID. Am attaching
an image of the engine boss with the ID info. Went to nastyZ28's website and found
the following info. d

2 numbers: Engine code stamping number = V0613CMF
VIN# = 17D496727

These numbers are clearly visible if you zoom in on the engine boss.

So the stamping number decodes to Flint, MI, June 13th, suffix CMF = 1975 Monte
Carlo, 350 ci. The VIN = 1(Chevrolet) 7(1977) D(Doraville).

Whoa!!! Wait a minute!! 1977???? That doesn't match the stamping code.
Anybody know what is going on here??

Jim