the 4g64 shares the same engine mounts as the 63 so bolting it in isnt a problem. its probably a pretty easy swap to do, with the most major thing you have to adjust would be addin the wiring for the cam angle censors and swap out the ecu. searching dsmtalk.com or dsmtuners.com would probably be very helpful. the only other thing i could suggest would be to buy a chiltons service manual and comparing the wiring diagrams between the two engines