Is a 66 440 block any good?

Dart Sport 360 said

As a base to build a 505 stroker? It's cheap but needs to be worked over. I was told the 74 to 78 blocks are the strongest. A new block is another option but depends on $$

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'69 and later blocks have the reinforcing ribs around the freeze plug area. In theory it should make it stronger, but whether it really does I have no idea. In my mind a 440 is a 440 is a 440. Any production block will be fine unless you're going for some max effort race piece - then you definitely want an aftermarket block.