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In the meantime you can also try this smallblock forum over at net54.
www.network54.com/Forum/119417
You can also do a "search by match" for part numbers there. I tried but came up empty so try...

Well that's the breakdown of the casting number but each intake has a paticular casing number. My books are 1000 miles away or I'd be able to better help you out. I'll be home this weekend so I can...

I don't know much about the smallblocks but the 8A16 on the intake is a 68/Jan/16th date code.

G.