Ok I just pulled off some 2.8 injectors to compare with the 3400 injectors I have in hand. Physically, the 3400 injectors its a direct fit on the Fiero 2.8, but the electrical connector is not the same. In the plug directly on the injector , for the 2.8 two small contact metal flat pin, but on the 3400 injectors it's two tiny round metal pins. And the connector exterior and opening is a little bit smaller.

The question is for who are using 3.4 DOHC injector or Mustang injectors on their 3.4 swap , does the connectors are the same as the Fiero? do you use the female connector on the Fiero fuel injection electrical harness or you was obligated to cut and fit the connectors that work with the type/brand of injectors?

I bought some 19# Bosch injectors that were supposed to be replacements for the Mustang injectors.
They plugged right in to my harness connectors.