[mahanian]

Did you have radiator cap off when it started splurting? If so, you can't really judge it by that because the cooling system doesn't work properly with the cap off. Also, every 1 psi of system pressure raises the boiling point 3 degrees so without the cap on your boiling point goes way down.

This might be a dumb question but are you spinning the water pump the right way? It's not a reversed serpentine pump or something like that?

Maybe you have a blockage in the block or heads. You can do a pressure flush, prestone sells a kit that uses your garden hose as the pressure.

You might have a trapped air pocket as well. You can burp the cooling system by putting the front wheels on ramps or something and run it for a few minutes without the radiator cap on, but don't let it boil. Just another possibility...