1985 720 pickup question

[yanktank]

I am having a problem identifying a couple of engine parts and have contacted knowledgeable automotive friends who have given me equivocating answers, hence current post. I posted the questions in a picture and would be greatly appreciative of any help. I have owned this truck since 1996 and feel like it is a member of my family and look forward to getting it back on the highway. It has 338,000 miles on it.
Many thanks, Rich.

[img]https://forum-attachments.sfo2.digital ... sort=1&o=0[/img]