daves inj will work fine with the ems you are using as it has built in support for peak hold standard on a 91 or the larger 550 sats, you adjust your duty cycle to correct a/f on the ems on the originals I thing you can check them for 2.5 volts p/h if I am lost about the correct voltage remind me whats correct for the 240cc 91 injectors later they went to 270ish sat inj for the 3.2 again its been awhile working on a c30