Jesus, Bret (LOL). Selecting a good block on the level you're looking for 'Dude, or myself, or anyone to explain to you is a little more involved than decoding casting numbers, and is hard to define with pictures and text, because there are so many variables to deal with. I mean for years, we were told a '70 455 was the holy grail of all non-SD blocks, but what we've found through research of blocks (and not neccessarily casting codes) is that some later blocks are just as good, and in some cases, a better casting.
I think you've got some good tips to go by already on this thread alone. The next step if you want to really get anal is to bring a micrometer and a ruler along with you the next time you inspect a potential block for purchase.
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Just a blind squirrel looking for a nut.
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