a quick & dirty check if your alternator is working take the blade of a pocket knife and hold it near the back of the alt. where the shaft is and you will feel a magnetic pull if the alt. is putting out. could this magnitise the pulley ? I do not know
I don't know if you have a exhaust cross over on your intake manifold,but I have had a couple 318's that were running bad and the exhaust cross over was completely clogged with carbon,cleaned them out and they ran good.
I had a car once where the lower hose had a bubble in the internal lining that was restricting flow and overheating,it looked and felt normal on the outside.