I've had that happened on a 440 block, call around to the heavy duty Deisel repair shops in your area and get the name and contact information on the welding shop they use to weld cast iron I ended up on my block having the deck surface brazed by a cast iron deisel welding shop then I had two sleeves installed and then had to have the block decked on a wet surface grinder. The head was cast iron welded and I had to find a shop that had a wet grinder to surface the head also, the regular automotive machine shops in SO CA said they wouldn't touch a welded head on thier equiptment because cast iron turns into a really hard material(it would damage the cutters on thier rotary broaches) when welded Good luck, let us know what you do and the shop that does the work for you please