I have a world aluminum block with a 572 B1 combo assembled roughly 4 years ago. Shortblock was machined and assembled at Ohio Crankshaft bought as a package. Motor was pulled apart before the long block was assembled and the short block checked out fine by my builder. For head gaskets Cometic MLS gaskets fit with out issue. Can't say how it runs as it has never been fired. Its also for sale as I decided on another direction for my car.