Oil Pan Leak (after modification)

GEO said

And while you are at it use the torch to heat up the spot you want dented in , then tap lightly

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or use the correct oil pan. It sounds like you have a later engine. The oil pan changed in 1967.

Another thing, if the engine is a 68 or newer, you need to put an adapter bushing in the end of the crank if using the 64 auto trans.