Car was tinking, sort of metal on metal noise, and would not accelerate. All of a sudden the engine seized and would not start again, and began bellowing white smoke from above the alternator, from deeper in the engine bay. What could it be?
Also, the tinking could have been from a vavle or ring from inside the cylinder that locked up the cam/crank shaft.
Either way, you are going to have to take the heads off to see.
Try rotating the crankshaft pulley in the opposite direction from operation to see if it moves. (Take the belt off)
If it moves, something is preventing the proper movement like an obstruction.
If it can not move, then it may be warped.