Hi! I don't wish to disagree by any means, but I have always thought the numbers on my truck matched: the number stamped on the block next to the distributor are also stamped on the door. Mind you this is a Canadian truck and it is a GMC so perhaps they did things different. Or maybe I'm missing something.

Pics are available here:

http://i128.photobucket.com/albums/p195/BassBucket/52%20GMC/20140815_193742.jpg

http://i128.photobucket.com/albums/p195/BassBucket/52%20GMC/20140815_193820.jpg