Is there an external vacuum switch mounted to the side of the engine bay somewhere? You have the electric choked version of the Mikuni/Solex carb that is relatively uncommon. That vacuum barb on top operates the choke release assist actuator (the diaphragm has probably gone bad in it anyway...) I found a vacuum line diagram but I'm not 100% sure it's the right one for your truck. In all honesty this carb is gonna give you nightmares. Kits are available to retrofit a Weber 2 barrel downdraft carb that will simplify the layout and massively improve reliability and performance. Lots of info on site if you want to investigate it.
I think that's the biggest trick is to find someone who - A: knows old school, and B: won't gouge the hell out of you for the privilege. It's not that bad to DIY if you have some mechanical skill, but you need to be able to install an electric fuel pump and delete the fuel lines from the original mechanical pump. The Weber gets rid off all the external vacuum circuit and anti pollution crap (excluding the vac advance for the distributor). We've had one or 2 members who have taken their trucks to a 'mechanic' and not been able to get it running right after installing their carbs.
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