Q: Did they put Vortec engines in 1991 cDo argo vans on 1991 Chevrolet Astro

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Did cargo vans come in Vortec engines in 1991
(1) Answer
As far a I can tell the 4.3L engines used in the 1991 Chevrolet Astro van were Throttle Body Injected Vortec engines. Beginning in 1992 the Central Fuel Injected Enhanced Vortec engine (That is the one with the fuel injector mounted inside the intake manifold.) was offered as well as the Throttle Body Injected base Vortec engine.