I agree something doesn't seem right. All the fittings are correct as far as I know. The one on the intake is original from what I can tell. The water pump currently on the car is a rebuilt one and had the usual fitting. Here's a pic that shows the water fitting on the intake.
Here's a pic that shows the hose. The clamps have all been changed since this picture was taken.
I didn't have the foresight to keep notes on the measurements. I may have to drain some antifreeze and pop that hose to measure things. Any ideas?