I've noticed that happening too. Also saw this add. Kind of skipped over it though cause he obviously hasn't got a clue.
$800 for the manifold? No. $800 for a full tri power with the car? Yes. Then it'd be worth it.
As far as the manifold, I think you're right. The heater hose hook up is on the top of the manifold, not on the front like the '59-'60 would have it. Good eye.