I really don't want to go jumping into a engine rebuild till I find out why it's not running correctly. The manifold crack is a hair line crack it's not an actual break the only reason we found it is cuz you could hear the exhaust leak from the front of the engine. I actually removed the engine oil pan cuz it was leaking and it was really clean in there, and visually everything looked good at least from the bottom, if anything I would just pull the heads, but the car isn't showing signs of overheating to be concearned with a blown head gasket at this point.
