Won't Shift Into Gear While Running

Quick update - talked with a couple of the 4 speed guys (Brewer's, Passon) and they said McLoed had a bad run about two years ago of pressure plates, right about when this one was purchased. The fingers were put in incorrectly and it allows the clutch to go over center and bind up. Sounds about what is happening with this car. Now to call McLoed.

Have you watched the linkage and arm through the sweep though?

It sounds like this is very possible, but you can very quickly rule out the linkage by watching it as it's depressed. If the linkage is setup such that it can back off at max travel, it'll need fixed anyway. Personally, I'd rule out everything else before going all the way back into the clutch.