What was the last carbureted production car?

[blunc]

Rochester 4GC then?

Yup, that's what was listed in the file I referenced. I've worked on a couple of those but literally hundreds of spreadbores.

[VW Dave]

The last S10 with a carb was the '85 model year, on the 2.8 V6 models (4 cylinders were EFI). There were no factory carbureted 4.3 S 10s.

I agree. My brother's '85 S10 had a carbureted 2.8, and our neighbor's '86 was TBI'd.