'63 Valiant Newbie

An easier way to tell which engine you have is to try to try and place your hand between the front most exhaust manifold runner and the block directly behind the waterpump. Pass you whole hand thru easily, a 225. Can barely pass a standard diameter pencil thru, a 170. If you have a 170 it is not aluminum. If you have a 225 stand by the driver front wheel looking at the block and exhaust manifold. Do you see freeze/expansion plugs? If yes you have an iron block. If no you have aluminum. Confirm with magnet as mentioned in earlier post. Congrats on purchase and welcome to forum.