Another vote for woody1. Great guy to deal with, great customer service. I'd suggest having him building you a shortblock. You're going to have almost 1800 invested into a stroker kit and machine work anyways. Woody will take care of ya.
ANY motor will leak oil if it is not built correctly. It doesn't matter what size displacement it is. My current motor seems to hold oil better then my original block ever did and my stock block lasted almost 175K with a vortech.