He has no documentation on the HM. I cannot find any casting number anywhere on the block. It is complete from dual 4 carbs to oil pan. He said he would take $12000 for it. It really looks nice. It has 68 heads with very large valve, I don't have an exact measurement on them though. I plan on pulling the heads off to look at them better. Is it worth $12000 i might be able to talk him down to $10K. What do you think.