I think about this swap from time to time in the advent of my engine ever expiring.
I think about it because I often wonder about if I could still use my Supercharger (fuel injectors are relocated on direct injection from intake manifold location to cylinder location hence "directly injecting") and how the drive-by-wire throttle control system could benefit a S/C equipped VX by eliminating the now "overly-long" O.E.M. throttle cable.
I believe that in the case of the S/C...plugging the injector holes in the intake and somehow either relocating our fuel-rail or making use of stock fuel-rail would be the big hurdle.
If my engine ever expires, I'll definately be looking long & hard at this swap as well as scouring the boneyards for any '04 Axioms w/good powerplants!
Having never seen the 3.5 DI motor with the top off, I would also wonder if the intake ports would be the same?
I would ASSUME that they used the same block...