Originally Posted by Siggy_Freud
Its very possible that the pump for the 2.8 multiport provides enough flow and pressure for the injection.
The in-tank fuel pump for an 88' TransAm with a 5.7L or 5.0L TPI engine and an 88' Camaro with a 2.8L FI engine list the same part for the Carter brand pump at Advance Auto Parts.com, P74006.
If it will operate a 350 TPI engine, it will operate a stock 350LT1 engine fine, IMO. But having said that, he should have still installed the new pump.