Welcome to the best place online for model cars Eddie!
I think scratchbuilding that cool intake will be the only way unfortunately the intake tubes and flanges would be easy, the top plenum would take some time to get all of the compound curves right, but it could be done. I think a substrate like sign foam, Renshape, or Balsafoam( http://balsafoam.com/ ) would be the way to go...