The loud tapping would most likely be a rod bearing - big money - the bearing is really just a thin piece of metal that protects the crank shaft journal from the piston rod. There is an oil hole right in the middle of it and oil under pressure keeps the metal from touching. The piston rod actually floats on this oil while spinning.

Run it out of oil and in very short order this float is lost and you have metal on metal. It only takes a couple seconds to burn out the bearing and cause the rod to rattle loose on the crank shaft.

If your knocking sounds like someone slamming the inside of the engine block with a hammer - this is what you have. If the knocking is a loud tick like a stuck lifter - maybe you only burned up a lobe on the cam.

In any case - its never good when an engine runs w/o oil.

The head being cracked can cause loss of compression - very hard to start and a heavy miss on 1 or more cyls.

The smoke could be coolant leaking into the cyl and being pushed out the exhaust.

Sorry for your loss