Does 1988 Chevrolet truck with 350 have fuel injection?

Yes, it is Fuel Injected. ...at the throttle body (TBI). TBI = Throttle Body Injection - Looks like a carburetor with a squirt gun pointing down through it.

Visit an online parts website (Autozone.com , advanceautoparts.com, etc..) that has online parts shopping and enter your vehicle specifics. Once entered, look for "injector" or "fuel injector". A carbureted model will not have these parts and will not be found if all information is entered correctly.