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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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