Did a quick search and didn't find any info.

I received the Clearwater head. The old head was already off by the previous owner. I was packing the old head to send back as a core. I saw AMC on the old head. Now, is this an aftermarket head or is it the original head? Is AMC the same company that makes the Isuzu 2.6 head? Anyone knows?

Now I just acquired a cheap '87 Raider auto with engine problem. Really want to do turbo on this one. I've read the bible many times. Is this doable for a person who had rebuilt engine twice? Do I really need the whole engine replacement or can I get away with just the top turbo swap? Thanks for any tips.