You should be able to get plugs for the block. Failing that you can cut the hoses and join them together. Use a piece of pipe to join them and crank some hose clamps onto it, shouldn't leak.
A third way is just to find bolts that fit the hoses and screw them in. We use that as a temp fix for plugging fuel lines etc sometimes.
Quick fix rip out the core and see if you can get it welded at a radiator shop.
(Message edited by jtnz on July 22, 2009)