Numbers matching?

[mahanian]

Ok, I searched previous threads and wasn't able to come up with a clear answer to my question. I recently bought a 67 C10 CST shortbed fleetside that was an old farm truck here in AZ. The truck is completely rust free and seemingly 100% original. According to the build sheet in the glove box, it was pretty well optioned including bucket seats, hub caps, A/C, power steering, wood bed, CST package, push button stereo, HD springs, and the 327/turbo 400 option, the biggest engine available in 67 on a C10.

The truck is completely unmolested, except for one problem...I can't verify that the engine block is numbers matching. I want to return it to prestine stock condition, but want to verify that the engine is the original first. The engine looks completely stock including the old canister oil filter but the spot in front of the passenger side head is blank, no date code or VIN stamping. The canister oil filter leads me to believe that the block hasn't been replaced since it wasn't offered after the early 69 production year. Is there a different location that the blocks were stamped with the VIN number?