Sorry for any confussion, the "C" is scratched on rear of block, where the "A" is in the other pic.
Some cobra blocks were only stamped in the
oil filter area, this helps in ID of type of block. Here is an excerpt of an article I found, I have two other similar articles by different publication's, but this was the best one.
Quote:
An FE block's casting date can be found just below the oil filter adapter on the front driver side of the block (see below). Casting dates follow typical Ford convention with the first character (a digit) representing the year, the second character (a letter) representing the month, and the last one or two characters (one or two digits) representing the calendar date in the casting month. The block in the picture above has a casting date of "9J15", which translates to September 15, 1969 -- early in the 1970 model year. Keep in mind that Ford first introduced the 428 Cobra Jet in April, 1968 as a mid-year option during the 1968 model year. There were earlier prototype and drag cars produced during calendar year 1967, so it's fairly safe to assume that block casting began no more than a few months in advance of production. Again, there are no absolutes here, but if the block you're looking at has a casting date in mid-early 1967 or earlier it's probably NOT a 428 Cobra Jet block. It MIGHT be a 428 Police Interceptor block, though.
Thanks to Dave Schouweiler for his contributions on this page.
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full article found here>
http://www.428cobrajet.org/id-block.html