427 big block pad numbers odd. opinions?

[bilede]

I have a 427 engine with numbers that appear to be C9Z16U3323. Anyone every seen a sequence like this? I haven't dug to the dates yet but thought it was odd. Help. Bill.

http://www.yenko.net/ubbthreads/pics/usergals/2014/03/full-670-10518-427_engine_pad.jpg

[resto4u]

looks like a bad stamp. i would guess a chevelle built in fremont Z code and vin#, i think the u is a zero. just a guess.