Sent you a message about this engine.I just helped a friend pull a very low mileage 4.6 out of a NAS 110 that had been upgraded. He has the receipts for the work and I think the engine has less than 15k miles on it. It was built with a 3.9 (v-belt & distributor) front cover so it would be a drop-in replacement for your 3.9.
YesSo the consensus is that a newer Rover 4.6 maybe dropped into NAS Defender 90 using the original wiring, ECU, 3.9/4.0 plenum with little to no mods and still be able to pass CA smog?
for the record, it should have said... can't go wrong with Tim.can go wrong with Tim.
Are you in norcal or where abouts?