New to forum. I have a problem that I have been unable to find answers for so I thought I would give this a try. Just purchased a 1952 Chevy Truck. It is powered by a 56-62 GM 235 ( casting number 3764476). While replacing a bad pushrod, I have found coolant leaking out of the 2 intake/exhaust side valve cover bolt holes. I did read that these holes should be blind, and the opposite side is clearly so. The intake/exhaust side are not. I removed the radiator cap and coolant (green) rushed out. I tried the fill with water trick, and the clear water turned green. It was clearly mixing with the coolant. I think I can insert bolts with a gasket of some type in order to prevent leaking when adjusting the valves, then pull them and install the valve cover. With that said, am I just patching up a bigger problem? Is there something else I need to do? , or further research? Thanks in advance.