When I get the 472 Hemi engine back from the machine shop, it will be broken in and tuned with the Fitech dual quad fuel injection system on it. I will have dyno numbers in hand when it is completed. The engine should be 100 percent and should run good and should stay in tune,with the roller cam and the fuel injection system. I am planning on bolting the cast iron Hemi heads on the 426 Hemi short block,and bolting it into the racecar for mockup for the exhaust system, and determine if the rack and pinion steering system that is currently in the car can be used with the Hemi engine. It appears that the steering shaft has to go where the oil pump is on the Hemi engine. I may have to go with a different type of steering system on the car.