fuel pump, fuel lines, adapter and tbi unit, wiring and sensors, ecm and time. I don't really see the point in an aftermarket TBI system when the GM ones worked just fine and are readily available fairly cheap. I bought a 91 Suburban for $200 bucks and kept all the EFI stuff and sold the engine, drivetrain, many other parts and made about $2k on it so a donor would be a lot cheaper if you haven't considered that.
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