Building a 77 motorhome 440

While money is definitely a big factor here, and I completely agree that a basic 440 build would be plenty, frankly I just want to build a stupid powerful motor. I have been looking at 440 source motor kits and I think id like to go with the 650 hp kit. Engine package no. 3. Does anyone have any experience with this kit? I appreciate all the replies by the way, I have tried other forums and havent gotten any good replies.