Bansheeboi501

Hey guys new to the forms I'm located in north Jersey Paterson area. Okay so I have a banshee that's been sitting for years but has a brand new 4 mill long rod crank and I could really use some suggestions on how and what to build looking to do a 421 build as of now the only thing I have is a complete bottom end and a set of jugs that have big bore sleeves that need to be bore over to next size. Any recommendations on who to bring my cylinders to and what carbs, pistons, head, domes I should run building it for trail riding thanks