Intake manifold date code ?

Looking at some 68-69 cast iron 383 and 440 intkes I have and I can't make sense of the numbers , one looks like it has a 9 and a 5 , or a 5 and a 5 , should be easy to guess that one.

The other looks like a 5 K O 7, I have a couple more to look at .

John

Here's what I have:

2806178 1.9.69
2206000 10-27
2951786-1 no date
2806301 11

M

my orig on the 69 VIP 383-4 was 7x24 cars SPD was 828..i have seen some weird ones also that made no sense.. dan