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The problem is probably either in the switch or in the actuator from the heat/defroster door but I'm betting it is the switch since it is stuck on the vent mode. Unhook the vacuum hose going to the switch. You can do this at the motor. Then start the motor. Defrost is the default mode so it...
Here are the mounts that I came up with for you.
Also 440 mounts for people to compare with.
These fit 69-73. Think 68 is the same.
The front plate is the same for 383/400 and 440. The rear plate and two bars are different.
74 has a completely different mount and pulley setup.