440 and 727 for sale on marketplace

Not if you "bore it to the max" as mentioned.
You never bore for cubic inches. You bore to get rid of wear.
Boring removes rigidity from the cilinders.

I never have understood why people say stuff like "bore it to the max". First, it makes them sound very inexperienced and immature, and secondly, as you say, it ruins a good block. Generally speaking, for about every .030" of over bore, you're only adding about 5 cubic inches. So, there's "THAT".