CK5
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What years for catalytic converter

does it have a heat shield for one? Does it have the original smog sticker on the grill support?

In CA, only the k20-k30 trucks went without cats in '85. All the "suv" and K10 trucks got them IIRC
 
It's based on gvw. So a 3/4 ton could come without. I think 78' was the last year for a 1/2 ton or similiar gvw.
 
If the fuel gauge says "unleaded fuel only" and the gas filler has the small inlet, then yes it had a convertor on it originally.
 
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