Steering Box decode needed

[sdkar]

I have a power steering box I pulled from a 68 Camaro in a junkyard.  The number on the case is 5691676 and 36 underneath that.  The date stamped on the top is 255 8.  There are some other numbers but I don't think they are relevant to determining the box's origin.  If other numbers are needed, post it here and let me know and I will add them. 

If I remember correctly, this would indicate the 255th day of 1968...Correct?  This would give me a rough date of Sept 12, 1968.  That would make this an early 69 Camaro box instead?  Just want confirmation because I am going to list it on ebay and want to make sure I represent it correctly.  Also, what other vehicle would this box be correct for?  Chevelle, Nova,...?

Thanks,

Steve 

[sdkar]

Okay...I cleaned up the cap better and it is hard to see if the number after the 255 is an 8 or a 3.  (It could have been a lightly tapped   The day stamped on the case is 249.  Is there a way to tell what year the casting was done?