Elephant in the room:
14mil stroke in OEM cases. Yeah you can epoxy the waffle ribbing on the bottom of the cases and trench them to take the 68mm crank, but the vibration is known to rattle cases apart on 300' machines. This thing needs to be able to roll in real easy and then be flogged wide open for say a full minute.
There is gonna have to be ample testing done to make sure the domes and pipes allow the motor to rev that high. Most big stroke banshee based motors are barely getting over 9,500. Drag guys kill shit with extreme load and shutter, the land speed stuff kicks the bucket over harsh harmonics. Speak with Crankworks or Falicon about balancing the rotating assembly.
Gearing, might need to call Robinson for a custom ratio trans. With everything on the market right now your probably gonna end up getting an RZ based trans, putting 2.08 primaries on, and 17-18 front sprocket up front with a rear sprocket barely bigger then the rear hub.