Help identifying Cummins

Ok overhead is complete
Turns out I have a 1984 9670 with a 1979 ntc 350 bc in it, who knew lol.
No antifreeze or diesel in oil but it only ran 10 minutes with new oil in it.
Dropping the oil pan to inspect internals
Now. Anyone tell me if rocker box covers have a torque specification please?
Also motor still turns over great by starter but not by hand at all no idea why.

 

OK, I need help started drop the oil pan took the oil line off the driver side and these two items came out. Any ideas?
Four more bolts to drop the pan I’ll keep you posted

 

Ok So I have a 350 small cam 1976 correct? What do you think those two little aluminum pieces are that’s the only thing I found in the line found nothing in the pan.

 

So the Pistons and the Sleeves look great. The cams look good crank everything looks good connecting rods so if there’s movement I need to drop the crank and put new bearings and spacers, correct?

 

What gets me is they were wedged in that oil tube if they came from the pan And they were wedged in that tube since the trucks an 84 and that motor went south. I wonder if these are remnants that they didn’t clean out when they put everything back on the older motor that they put in it is that a possibility?
If the crank doesn’t move back and forth, then I’m good?
I guess maybe the rest of the pieces could be on top because that’s all I found and would that stop it from turning over by hand with the accessory drive?