I have a 64-1/2 convertible that has been in storage for 15 - 20 years. It has a 289 in it. So far I have replaced the water pump, thermastat, and replaced the 2 core radiator with a new 3 core radiator. The engine is overheating. I am not sure why. When I took off the water pump one of the two holes behind it was completly blooked with calcium and lime deposits, so I cleared it out with a screwdriver and flushed out both holes with the garden hose. When I start the engine with the radiator cap off should I be able to see the antifreeze circulating thru the radiator? It's not. I can leave the cap off untill the thermostat opens and still no circulation. Any ideas?