You state that you have had 2 different short blocks and the mikshake continues. I would be looking at the top end. Take it apart and look at the gaskets carefully. Head and intake. Water leaves a rust trail and is sometimes not that hard to find. If a head is leaking water it may show you something as well. Water acts like a steam cleaner and will clean the carbon off a chamber or piston. Get the heads pressure tested. Before you take it apart, get a cooling system pressure tester on the radiator with it full of water. Pump it up and see if the pressure drops. Pull the spark plugs before you do the pressure test. If water is pushed into a cylinder you'll find it real easy when you turn it over. You'll know what cylinder your trouble is in if it does shoot water out a plug hole.......
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