I found another source identifying alloy % content mark: "010 and 020." The first being tin and the second nickel. I got the 010 mark but not the 020 so that follows with what you found - oh well. I'm about to take it in and get it magged and all that...will help me decide how to build on it. First engine build, going to be either 406 or 427.
tks for info guys!
James