Actually easy.. It only takes $ and connections... The bore is 3.6875 After that Venolia will make you anything you want. Send me a PM and I will give you the contact. You can buy top fuel pistons and plasma moly rings in pretty much any size and configuration you want. You can also put the pins in where ever you want. So for example Chrysler got the huge stroke in the shorter rods and crank. You can put in 238 ci rods and put the rods in a different position. I can also get you custom rods any length and configuration you want. None of that is cheap, but it can be gotten and its no where near as difficult as you might think!