I think I finally have this sorted out. As I mentioned before, I have a complete set of '74 3-speed wipers from a B-body. (These will work on an E-body, right?) I am assuming this is the first year for the plastic bushings. This seems like a good thing because I can still get replacement bushings at the local parts stores if needed. I have a working 3-speed motor from a '74 as well, and it's all wired up and ready to go. Harness is good to go. Just ordered the proper variable switch tonight, so I that's all I am waiting on. Should be here in a few days.

Am I missing anything else?