Thanks for the link! looks like it needs to be a bit hotter before I can ensure if it's working or not.
I pulled the lower hose off and ran some water from the garden hose through the rad. It seemed to have no problem with flow, so should be able to assume it's clear.
Have the shroud and a higher flow Mopar P5249559 water pump on the way for next week. Even if the pump is not an issue I'd rather replace the old jobber one from 22 years ago.
Might put the old 7-blade fixed fan on this weekend and see if the rad temp drops a bunch. That would narrow it down to an airflow issue.
Lots of other little projects in the meantime, finally fixed the loose rear-view mirror! It would swing around every time you gas, brake, or turn.
