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I will go the other way , I believe this is a 6T is a 76 block / engine 440 E cast crank HP if the E was in front of the 440 I would say 69 but after is cast crank http://www.moparts.org/Tech/Archive/motor/36.html
This is what I found6T = 1976440 = CIDE = Cast CrankHP = High Performance (never heard of 1976 HP block with cast crank - so maybe cop car?)7142 = 10,000 day Julian Calendar (you'll need to check your numbers again 7142 = 2/15/81)References:http://www.440source.com/blocks.htmhttp://www.440source.com/blockinfo.htmhttp://www.moparts.org/Tech/Archive/motor/36.htmlhttp://maxwedge.com/articles/10k.php