Having trouble finding useable 2-piece seal 350 for 383 build (for the street). I have a 2 piece seal crank (also have rods and pistons, that's it). I'm thinking about using a '86 and later 1 piece seal block (more plentiful). I understand I need an adapter ($100) to convert to 2 piece seal but I've also read about an alignment tool ($90) for installing the adapter correctly. Any other issues and costs involved? Should I pursue this approach?