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I just removed my 920 heads off the 66 273 dart. I'm trying to thread to help id the pistons. They have 4 valve reliefs and say 040 on the dome. I'm really mostly curious what the 040 means and it there is any way to tell if they are stock

Been looking around and there is a lot of information out there and a lot of contradicting information as well. I have a 66 dart gt vert that I have been slowly modifying. Came with a 273 2 bbl, I have a new mainfold and 4 bbl on there now, msd box, new distributor. The rear end is now a 8.75...