It doesn't look like a 400 to me, but I'm no expert. The oil dipstick isn't in the right spot for a 400, at least the ones I have. In fact, I can't even locate the oil dipstick in the pictures.
Hey wait a minute. They checked off the A/C as being good, but where the heck is the compressor? The shaker sits crooked too. Someone did some pretty crappy prepping to the engine too. They painted the pullies blue. All the smog stuff has been pulled from this thing. I guess it could be an old engine dropped in in place of the orignal, but the only way to tell is to get the numbers off it.