Sounds like the vacuum passage to the secondary diaphragm is plugged or blocked somehow, possibly a wrong gasket. I can't recall how the secondary gets it's vacuum, but by tracing the port to it's source, you should be able to find the blockage.
There may also be a secondary lock out associated with the choke. Some lock out the secondary until the choke is fully open.
There are advantages and disadvantages to the Holly/Edelbrock swap.
I personally detest Holly carbs! Difficult to tune, prone to leak gas. Did I mention they are prone to leak gas?
The advantage to the Holly, assuming it is the factory carb, and you say it runs well other than the secondary problem, it is already tuned and jetted to that engine.
My opinion, the Edelbrock is a better carb, but if you put it on, you will need to modify the throttle linkage, modify the fuel line, somehow make the choke work, and go through the tuning process if you intend to get it to perform properly and get all the gas mileage it can get.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let�s make one more addition to our series on hydraulics. I�ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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