GlutonforGloom - The rough idle could be due to a vacuum leak. With the many lines for the feedback carb, their age and the SoCal heat, it's a possibility. Inspect them and brake booster line for cracks or breaks or use the propane method to check for leaks as described here:

https://www.thedrive.com/maintenance...r-vacuum-leaks

If you remove any lines, suspect that a PO has messed with them or want to confirm their routing, Post #2 of this thread has a good diagram of the hoses and their connections.

http://www.mightyram50.net/vbulletin...vacuum+diagram