Cecil, yes .080" is usually considered too thin, but I already have a block that was bored to std 409 so I figure if it has that much then I'm going to take the gamble and build it instead of scrapping it or relegating it to mock up use. It would have to be a budget build for me to take the chance and it's not a valuable block by any means. There is no way I'd build your true 409 block as thin as .080"....especially not a 1961 block.
Yours is at least .100" everywhere so if it doesn't need further boring.....IDK what I'd do. Looks like it's either build it, or sleeve 3 cylinders. I think I'd build it.