crankshaft question

Back in 1973 Wheeler engines thought they would be smart and drill the back of their cranks so that the same engine would work in a auto or stick application. What a NIGHTMARE that created. The cast cranks were to porous and oil would leak thru the casting and leak out the drilled hole. After 2 main seals, two pan gaskets, three more time R & R'd to check cam plug, oil galley plugs, I found out the problem!