ok so your saying the non sai will hook up to everything it can that’s non sai and then run.
And at that point I could do two things
rebuild the heads off the old one to use and swap them out down the road.
or get the ecu and bcu and cloister from a non sai 03-04 disco and swap them and I should be fine.

and oh yea save all the sai parts from the old engine

 

I don't know what you mean. "Hook up to everything it can that's non-SAI" is basically "hook up everything that any engine would require." I already said that the only place any SAI components connect is to the heads. That's a total of four air injectors and four small bolts for the retaining brackets. Personally, I don't know why you wouldn't refurb the SAI heads if you're going to the trouble of doing a whole engine swap.
I believe that it will run without the SAI, but it will throw a CEL and with that lit up, you won't be able to tell if anything else goes wrong.

Whether or not you "should be fine" if you swap the ECU, BCU, and cluster depends on your definition of "fine." There are a lot of other systems that could be set different between your truck and the donor vehicle (e.g. air shocks or coils, various accessories, etc.). You would need to get your hands on a Nanocom to make sure everything was set correctly for your truck. You (or a subsequent owner) might also run into trouble registering it or having it inspected if the VIN stored in the system is different from the VIN on the vehicle plates. Depends on how closely someone looks.

 

hey thanks that does answer what i needed.
this is our daily driver so I have to minimize down time.
And then I will get the original heads done and do a head swap when things are easier for me.
all I need to do then is make sure the heads on the replacement engine are true also I plan on going with the arb head studs too.
and like I said earlier I am getting confused on this.
thanks mollusc

 

you need an unlocked Non-SAI ECU. Willtillery@roverguy.com posted on dweb recently that he had an unlocked one.

as for a 4.6, don't do an 03-04 block. Get a 2000-2002 range rover 4.6 engine, as they received the best machined blocks and is a direct bolt in.

 

the place that I might be getting this one from has the cluster ecu and bcu from the same rover

 

I swapped my 4.0 without SAI into my 03 that had a 4.6 with SAI. Runs fine just the check engine light code (I just hit suspend on my gauge) works fine

 

looks like you need the BCM/ECU and a new keyfob remote from a non-sai truck for it to work with no codes. I'd contact will tillery(although the one below sold) and order up what you need.