Hi Dennis, pull the Fuel Pressure regulator line and see if there is gas in it...that's the down & dirty diagnostic that may give you a fast answer. You could also do the KOEO fuel pump test in the garage just to see what the pumps are putting out. The test is in section 6 of the FSM. I know on my 90 I replaces my pumps just because they were 18 yrs old.
May I ask who rebuilt your injectors? Usually our GM injectors don't respond well, specially the 90 & 91 injectors, to rebuild attempts.
Tom