Yeah, even worse, even if they are the right heads, I have no idea what the bottom end is. I suspect the bottom end is not a Commando engine at all. He advertised this as a complete original 1967 Commando 273 out of a Formula S Cuda. It clearly is not what he advertised. Head numbers will not tell me what pistons and cam are in the block. And either way, it is a Frankenstein assembly which I think I should walk away from.