from my understanding everything bolts on and you could take the CPU and wiring harness and swap all that and run the full motor.
but i the best case run the head, ntake, exhaust and TB from the HO. the TB will need to have the TPS from the old Renix motors TPS.
you will need to use the CPS,Knock and TPS from the old motor.this includes the flex plate/flywheel and the distributor.
if you want to run the newer HO fuel injectors and rail you need a fuel line extention for the return line.the ERG valve will also need to be removed.
i have lots of info on this now been searching for about 2 weeks strait.