What have I done

Nice. I did similar to my 65 Dart 273 - everything off the firewall including heater box & steering, but left the engine in (intake, valve covers, distributor off). Doing similar in my 64 Valiant slant, but stopped at the blower motor until I remove the box.

So, you left us hanging. How did your turn signal switch sliding contacts get installed wrong? I assume you replaced your cam (self-canceling arms usually break). Did the contacts pop out or did you remove to clean and forgot to take a photo first (do I do that? you bet).