This just adds some info to what was already mentioned, plus one other item important for 1970s. Your truck originally had a heat-riser valve and I suspect it was eliminated when those headers were put on? It used to force heat under the carb to warm in and that made it drive better in cold weather. Also, for emissions reasons, if the intake manifold had been off - often the new intake-manifold gaskets have little tin plates blocking heat to the underneath of the carb. If that was my truck - even with no heat-riser - if it was an all-year driver I would want those tin-plate removed - assuming you have an OEM intake manifold.
Also - if that carb had been apart? As the last poster mentioned, there is a small steel check ball in there. If it got lost - the accel pump cannot work and it will bog whenever you stomp on the gas. Same if the pump umbrella seal is hard.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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