I called 2 shops locally to me. One said they would not be comfortable welding the crack, and the other said it can be done, but it isn't cost effective. The most experienced shop said to get a ITM head. He said they are all made in China, but the ITM heads come with higher quality parts. He also said all the head gaskets are made in China, but one one brand was better( will try to remember that brand). I asked about head bolts and he said re-use your bolts, just torque them, that they can be re-used as they are not stretch bolts. Now I don't know what that is(stretch bolts, or a stretch bolt head), but I pushed back against re-using the bolts. I told him that everything I read online, everybody says get new bolts....he said "they don't know what they are talking about".
I think I've read every thread where a G54b head was replaced. What I haven't seen is whether or not all the head castings are all the same, aside from being jet valve, or non-jet valve. Also whether hydraulic, or solid lifter cams are identical, and can be swapped. I did see one post that swapped over to hydraulic lifters, but it wasn't clear to me about the cam. I'm not a gear head so I don't know these things. The shop that quoted me $615, or $735 if they swap over my cam and lifters told me the head, and cams are the same. The only difference involves the jet valve and they recommend the non jet valve. I want to keep my parts as I believe they are low mileage, but I haven't decided whether to do the cam and lifters myself, or pay the shop $120 to do it because I don't have a very good work place. The shop said it's easy work just time consuming, and they charge 1 hour. They thought if I'm willing to pull the head, I can swap over the cam and lifters. I haven't made up my mind yet.
I wanted to pass along what I found out so the next guy with this problem has a few questions answered, I couldn't find. I think I might re-use the head bolts, and if I do and have another failure, I will be back to report on it. So far I haven't found anyone re-using their Mitsubishi head bolts except a video where a guy does a lot of Toyota heads, and he always re-uses the head bolts.
I would say that everyone has to make their own decisions, but it sure is nice to get input here from guys that do their own work. I really appreciate it!