Coolant coming out of timing cover bolt hole

I have a 68 340 and noticed yesterday coolant leaking from the gasket between the timing cover and block. We pulled the front of the engine off to replace the gaskets and it appears as if coolant is coming out of one of the timing cover bolt holes. Do any of these bolt holes go through coolant passages like the outboard header bolt holes do or am I looking at another problem like an internal crack in the block?