Water pump id

[Mike67]

I have two water pump housings and am curious what year they are. I've tried googling ect to try an decode but have found little on the topic...
One is a 3751216... & has a big CB..Is it decode the same way a head is? 1977?
Other is 3698468 & has. 2J on it...what were they off of? Anything different about them?
Thanks guys

 

[Mike67]

???? Anything????

 

[cr8crshr]

I ran the part numbers but came up with a blank. From the looks they appear to be for BB's however the the bottom spout is on the right side as opposed to the left side which is slightly more common. Hope I helped...cr8crshr/Tuck...