You idle problem and the fact that it dies could be because you have a vaccum leak.
Plug the area circled in red with Epoxy, Quick Steel, or JB Weld.
Looks like you are not using the ( Throttle Controller / Idle Diaphragm )
Did you leave it unhooked?
First thing is first, plug that hole in the picture above.
Turn the screw on the throttle controller counter-clockwise (OUT) so it doesn't put any pressure on the linkage plate behind the screw.
Next start and warm up the engine fully and set the idle around 800-1000rpm using the THROTTLE STOP SCEW (Black Screw at back of Carb)
now hook up the throttle controller to the plugged vaccum port by the accelerator cable.

Scew the throttle controller screw clockwise (IN) till it touches the plate and raises the idle a bit, now turn on the headlights and other accessories you may have and try and get the idle to be around 1000 rpm or less if you can manage it.
are these vacuum post sealed? what am I looking at excatly? It looke like a cut hose.

Anyways if those rear vaccum ports on the Brass colored metal pipe at the rear of the intake manifold are not being used then they need to be plugged to avoid it leaking vacuum.
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