I know I'm getting into this kind of late. I am very familiar with Mopar flat heads. If your original cyl. head can at all possibly be saved , DO IT. 57 and 58 230 engines had the best flow and highest compressions of any 23 inch long mopar flat head sixs. Cast iron parts can be welded by someone who knows what they are doing. The entire part needs to be heated several hunderd degrees and then, while hot, you GAS weld the part with cast iron rod and flux. DO NOT EVER EVER WELD CAST IRON WITH ELECTRIC ARC WELD. The part then needs to be cooled ever so slowly. Total remachining is then needed. Edgy Machine in califonia does make and sell new alumium cyl. heads for all mopar sixs. Do not confuse this site with Eggy Machine in Cal. Although, Eggy can supply all of the parts you can ever need for this or any older engine. There are several things that can and should be done with oiling system of this engine. If you are still rebuilding it, contact me.
