Please explain evolution.

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Your quote from the Talk.Origins site suggests that 70-80% is the extreme range which some proteins can tolerate rather than that most can, as you claim. Going by any normal system of referencing it seems likely that they cite no reference for this figure as the nine references are all from points 1, 2 and 4.

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On the flip side, convergent evolution can create functionaly similar enzymes that differ greatly. That is, there is more than one way to skin a cat, if you get my drift. The interesting part is that these analogous but non-homologous proteins often share a common active site but can differ greatly outside of the active site. I will agree that 70-80% change in the SAME protein is rare, but 70-80% dissimilarity between proteins with similar enzymatic activity is not uncalled for.

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Certainly! I wonder how far that goes in terms of higher conformational structure rather than amino acid sequence?

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That is a good question. The only way to confirm conformation is through protein crystal formation, which is a tough to come by since some condensations/crystalizations take up to a year and require large quantities. I'll do some digging when I have a chance.