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I've never had blocks side by side to look at and I don't think we've had a thread here where we have had multiple pictures to compare. I didn't originally post the casting # to see what you all thought without prejudice. Now seeing other pictures it looks like the webbing out to the dowels and the thicker pan rails are the tip offs.Be intersting to get some 455s 2 bolts , 2 bolt drilled for 4 and 4 bolt blocks. We can get a data base to make it easier to tell.

I'll have to take a look at the later block I used for my RAIV 400, it was only a 400 hp motor but would spin 7000 with the solid cam.