Why not a 413 ?

Same advise . Pistons are an issue . Max Wedge pistons require Max Wedge heads which require Max Wedge intake which require Max Wedge exhaust . A lot of older 413s have old style freeze plugs that require a blow with a hammer to install . Truck/Industrial have a funky front drive . Marine 413s can be standard rotation or reverse rotation . They also have a funky front drive . ALSO , 426w have industrial/marine applications . Same problem with pistons .