That Port tube needs to be blocked off, there is a smaller port tube just in front (forward) and a bit higher up of that larger one. It has a flat head screw inserted in it. Take out the screw and plug the Distributor to that one. If you use the wrong one the distributor will be advance way too early and you will not get the timing correct if it is connected to that wrong one. You want the distributor to advance in the higher rpm, not at idle.
This is if you installed the carb with the choke on the drivers side of the vehicle. In the image below, you are looking at the usual drivers or left side of the carb as you are facing forward in your truck. Be careful to get this correct and to examine the image below to compare your installation. If you put your carb in on reverse, then it will be on the other side .
The spare tube that you end up blocking off can be used for a vacuum gauge which can help diagnose problems. This gauge can be installed full time and placed into the cab of the truck to also show your fuel usages or heavy foot driving. It's a productive gauge that rarely people use, but shows a lot about engine condition.
That diaphragm thing can be plugged on both ends. Or, removed and place a block plate over the EGR holes left behind when it is removed. Nice to have extra room under the hood.
carb.jpg
Originally Posted by BradMph
That Port tube needs to be blocked off, there is a smaller port tube just in front (forward) and a bit higher up of that larger one. It has a flat head screw inserted in it. Take out the screw and plug the Distributor to that one. If you use the wrong one the distributor will be advance way too early and you will not get the timing correct if it is connected to that wrong one. You want the distributor to advance in the higher rpm, not at idle.
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