If they have tried to fix it twice, it sounds like he put some time into it. He likely discussed it with his contact for MP - and didnt get anywhere. It is possible that his MP contact is another distributor - therefore adding a layer to wade through.

I know that doesn't help you with your issue - and I am not saying your engine builder shouldn't fix it. My friend has a 392 Hemi built by a well known engine builder in the Cincy area - and his rear main started to leak. The builder told him they would fix it once for free.