700 on long hill is not unheard of. But if you are seeing 500 that might be more normal on a N/A 3B. I put an EGT gauge in my cruiser before i turbo'd like 20 years ago and was shocked how low my fuel was turned down. When I bumped it up it got hotter, but had more power. I tried too much
and then it was hitting like 1300F. SO I dialled it back. I cannot stress enough how much a turbo makes a 3B a normal engine. They are very slow and chuggy without it. I think it's awesome you put a 3B in Land Rover.