Is this a closed loop cooling system? Is there anti freeze in your motors of fresh water?

Yes, it is a closed loop system.

So back to my original questions after this drive identification debacle.

-What kits do I need for both my alpha drive and the engine driven pump pictured here?

http://www.boats.net/parts/search/Me...%29/parts.html

I'm going to say if you order the kit for a 260 Alpha One that you will have the drive covered...I do believe all of the Alpha One and MR drives carry the same water pump impeller and replacement gasket kits for water pump service...probably the most common drive combination ever produced.

As for the Tempest raw water pump I would contact the vendor in your link at boats.net and ask them.

Hey sprink I want to run something by you.
So the engine and drive systems are cooler independtly on my boat. And the seawater is introduced in to exhaust system at the bottom of the risers. Would a better way to go be to route the seawater to the transom fittings where the alpha dumps its water overboard? I'd like to run the boat in salt water and without that running through the risers it would extend their life a bit huh? Forsee any problems other then louder exhaust?

I believe what you are talking about is what is known as "Dry Exhaust"...don't try it...the risers and manifolds will run too hot and set the bilge on fire!!

I sure would see a few pics of this. Where are the heat exchangers located?