The date code is C7\9 which makes it March 7,1969 not July.
Above Added: Wed January 29, 2014, 6:44 pm EST
This is a CE stamped engine which means it was put in a Corvette as a warranty replacement and that means it is a numbers matching block for any Vette built 3 days or more after it's build date of july 69.
Above Added: Wed January 29, 2014, 1:51 pm EST
I have a 427 L72 BBC engine for sale that is mostly complete and a bunch of other parts like a TACH DRIVE DISTRIBUTER! I bought this engine from a friend 30 plus years ago so IT IS NOT STOLEN so please don't bother me with inquires about that. Call me if you are interested and I'll get the block numbers and such for you. 631-871-9952, Andy