Holley Sniper Issues

does it have a cam position sensor? If modern EFI doesnt detect a CPS or crank position signal it will kill the fuel pump. Do you have a NOID tester (injector pulse light) If they are not cycling then no start. There should be a hot wire on each injector when ignition is on start or (idle) run, it will cycle the ground side if you can get to the harness.