Very hard to see on the video (for me anyway), but the smoke looked black, which would be a rich condition.
Oil smoke is usually blue or a bluish white. Sometimes a sooty tailpipe mixed with condensation will look like
oil as well.
Based on your description, I would have your mechanic check out the valve seals and intake manifold gaskets just to be safe. I wasn't aware that these engines came from Ford with intakes installed. Did your mechanic install it?
Engines will need a little break-in time if they haven't been dyno'd.