This is what 2point6 told me awhile ago:
My opinion is to go OBD1. Use the ODD1 injectors since you already have a resistor box. You can run OBD2 injectors, but you need to delete the resistor box to make them work. Modifications to the fuel rail will need to be made because the early style injectors are a lot larger than the Euro R injectors. Again, I also feel that the area around the injector's spray pattern needs to be opened up to keep fuel from accumulating on the manifold. See my Euro R manifold how to.

My question is: what i should use to modify the fuel rail and the area around the injectors spray pattern as suggested. Just like a dremmel or what...?

 

yes you need to use a drmel, look at 2point6 installation and see how he opened up around his injectors, and stay with the obd1 injectors.