High idle...
Make sure the vacuum hose from the distributor advance is connected to the ported vacuum nipple on the bottom of the throttle body, not the intake plenum. In your video it appears to be connected to the intake plenum which will advance the timing and speed up the engine.
If all else is good you can adjust the idle on the top of the throttle body; the 17mm locknut holds the slotted idle air adjustment screw tight. Turning the slotted screw in (right) reduces air bypass around the throttle and lowers the idle speed, out (left) increases air bypass around the throttle and raises the idle.
Congrats!