engine codes

I'am new to inline. i bought a 1967 Mustang coupe for my son I got the # off of the block and they say c8de-6015-b I know that it was made in 1968 and for a Ford falcon and made by engine dept. but what does the 6015-b mean?

thank you for your help Kevin
 
6015 is Ford's generic number for cylinder block and all blocks have the same basic number. The B means it's the second design. To find the actual year of the block you need to find the date code which can be different than the casting code.
 
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