I agree with Sav. There is a thread somewhere about the total cost of the Crawford conversion including all the internal and drive train parts they had to replace. It came to a lot (around 26k $ is a remember correctly). If you don't have too big an issue with importing, there are 3 companies state-side that do built bottom ends. @
FullBlownmotorsports are probably the best to speak to if that is the kind of power you are after as they offer a lot of different packages for the car. Hope this helps. With 500hp this car will be an absolute rocket