Did the 1979 Chevrolet truck 1 ton 350 cu in gas engine manual transmission come with a catalytic converter as part of emission system thanks for any info?

No, 1979 Chevrolet 1-ton trucks with the 350 cubic inch gas engine and manual transmission did not come standard with a catalytic converter. While catalytic converters were becoming more common in that era to meet emissions standards, their use on heavy-duty trucks like 1-ton models lagged behind passenger cars. The emissions systems on those trucks typically relied on other technologies like less efficient exhaust gas recirculation (EGR) and other less effective methods.