Engine out, couple questions...

[NorCalC20LWB]

Pulled the engine last week for a rebuild, while out want to clean up/paint the engine compartment plus replace rotted parts. What is the name of the rubber wire protector/shroud on top of the firewall? Could not find it on the "Classic Parts" website, which I've had good luck with in the past.

Secondly, pressure washed the engine bay & suspension, and the A arms sure don't look 44 years old to me. Upper A arm is stamped 3785 on one side, 3786 on the other. The rear end is out of a mid/late eighties 3/4 ton, could the front suspension be non 72 also??