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OP said its a TBI 4.3 from 1990. No "spider." (never heard that term used on a gas burner) Just a hard line from the tank to the throttle body an a return line back to the tank
1992 they did have a multiport 4.3 option but its not standard. Cost to much.
No codes, uga...
I am the one on the sun roof, trying to keep my butt dry.
I have only seen one that was not TBI in my life an it was a 1992. I think multiport was a high end option sense about 1986.
Dealer may order different options in different parts of the country.