Oil Leak out of Crankshaft Pulley

[tjhooker125]

I was looking at a '52 3100 for sale today. Someone had put a 235 six in it, in place of the original 216. There is a funny spot for an oil leakwhle and after the engine runs. It comes out of the front of the crankshaft pulley/ harmonic balancer, right out of the center hole where the old manual hand crank goes in. Anyone know anything about this? The fellow selling it said that it just needs some type of plug/ washer/ gasket item changed? Unfortunately I don't have a manual for it nor do I know what year the engine is.

Thanks guys, TJ