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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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