Id tag info

I just bought a 1970 429 engine. I have the tag that was attached to the motor. There are a couple of codes i don't understand and can't find info on.

Tag reads: 429 71 7
0-J KK815-JG
Can anyone tell me what the "7" "KK" and "JG" stand for in this code?

Thanks

here are a couple of links maybe of some help till one of the folks here chime in.

http://429mustangcougarinfo.50megs.com/IDTAGchart.jpg
http://wrljet.com/fordv8/idtag.html
http://wrljet.com/fordv8/specs.html#K
good luck