After further testing, I've been able to determine that I have 1 stuck injector and 1 partially stuck injector. I took the injector from 1 and swapped it with 3. Then I jumped the RPM relay to run the fuel pump with the air plate fully depressed. Now the #3 line isn't flowing but the #1 line is.This is good news because it means the fuel distributor is good.
I decided I would take all the injectors and put them in a carb+brake cleaner bath for a day or two fully submerged. Then I'll test them again to determine if they need to be replaced.