This is the sort of utter rip-off you get from these apalling price-gougers. That's worse than Volvo, and man but they are bad.
Being rather pro-American, and on your American behalf, I called the UK dealer Stephenson Marine about 5 minutes ago...
Stephenson Marine - The Watermota Sea Panther
...and your infamous item number 56 is available for £65.39.... close to about $100. That's about 8 times cheaper.
The dealer recommended buying the "water pump kit" which has the bearing assy, impeller and a few other bits that will reclaim your leaky pump. It will take the wobble out of your pump situation, I am reminded. That assy costs £108.53, or close to about $180. Still far better than you have been quoted.
You can now tell Torresen Marine to ram their item number 56 up their expensive rear. Perhaps they should be working on Wall Street.
Don't tell them why they should ram it up their rear, but do tell them where to ram it.
I say again, don't tell them why.
It's best not to discuss price differences with Stephenson Marine either.
This sort of chicanery makes me livid. I see it with telescopes all the time. We can get round it.
If you have difficulty, or the price is not as I was just told (0820 hrs UK time this very day, Wednesday), send me a PM.