thanks for posting that those. it made finding the numbers on the front of the block a bit easier. even funnier is it looks like i got the same year block out of the same plant as you but i guess someone decided to stick a 77 4barrel intake on it. i just need to find the casting number on the side of the block to find when it was made. might look for them next time i have the exhaust manifolds off.

also found this
http://web.archive.org/web/200904081...gnumbers4.html