unless doing a resto, basically, a hard to find pistons for engine than the 413 engine. Sure, having a 426 MAX WEDGE, complete with crossrams looks cool....
We had a guy here that had a MW426 in a 1964 Plymouth and thought it was the "End all" for performance Big Blocks. Until a friends little blue Valiant crushed his dual carb'd Wedge with a basically stock .030 over 440.
Again, good engine, but when you can get pistons for the 440 cheaper and more plentiful, it kinda makes that engine a hard sell.