I'll add that I'm not anti FI. I have 3 FI vehicles, 2 of which have near perfect FI systems. They are Lexus Is300 and an RX. Excellent. And a Cummins 6.7 that I'm quite attached to. The 6.7 isn't quite as refined or dependable as is a Lexus.
Still, when comparing old Chebby TBI and even later FI, Quadrajet is better. The LS and later Chevys are much improved systems.
Chevy threw whatever parts were laying on the shelf into GMT400 fuel systems. GM LT1 and LT4 FI was pretty good, but the package was saddled with OptiSpark. Even OptiSpark worked well...til it didn't. Had an LT4 (think headers) in an S10 and changed the ignition system out once. Welcome to GM. That said, the LT4 was an excellent item. The Opti failed slowly and never made me walk. My K2500/489 with a QUADRAJET never caused issues in 5 hard years of service. Never touched once the project was completed. Changed plugs once, but they were in good condition. Quad produced about the same mileage as the sucky 454 FI. Had a fuel ratio meter that told me. I don't so much blame GM as much as the Feds and their goofy, ever changing, emissions requirements. That coupled with the feds protecting medium trucks from import competition, created the mess. I'm still a fan of American made trucks. Alas, I drive a Fiat truck...bummer...
My K2500 was a favorite. Good truck...once carbureted...[emoji6]
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