1) Remove spark plug wires from Distributor
2) Remove Distributor from motor while still plugged in
3) Turn ignition to on (if fuel pump turns on, continue..if not, fix fuel pump)
4) Manually turn distributor and listen for the inkectors to click.

The Distributor controls the firing of the injectors. You should be able to physically hear them click one by one if they are good. If they dont click, double check your distributor wiring with the MSD or It could be bad/clogged injectors.

You can remove an injector and run power straight to it to see if its bad also.