Well as the name "modular" implies, they will physically boltup to our blocks, but we have to do some modifications to our oil system I believe, something to d with a plate....and then W/O the 05s EEC we wont have the VVT, for whatever thats worth. It would be better to go 4V if your going through the hassle. Better flow, better mixture=better performance.
its not only that. remember that the 3 valve heads have variable timing cams in them also. so the easy route would be just throw in the 05 motor in the car with wiring also.