The bigger issue than the engine is the transmission. I'm sure that with any amount of searching I could find the perfect small block for this application, but I am not a fan of the SM465 trans. I've had pretty limited luck finding reman ones, and I'm hesitant to buy a used one after how many I have seen go out. Anyone know the length of the 6.0, NV4500, and an adapter like the one from Advance Adapter? How does it compare to the 350/SM465 length?