I personally think it would be better to just drop in a fresh 4th Gen motor with under 50,000 miles on it. When you rebuild an engine it doesn't go back to 0 miles... people have to remember that. So if you drop a newer motor in with 50k it would probably be better for you than if you paid out the ass to have it rebuilt. Parts alone to rebuild are probably around a grand. Also, most junk yards have 1995-1998 Maximas and they will sell you the engine and pull it out for you for around $1,000. I found 3 different places with one in NJ. One place told me that they had a 2001 Maxima SE that had been in a rear end collision. The odometer read 24,500 miles and that they would sell me the 227 hp engine and pull it out for me for $1,200. They also told me that I would get a startup warrenty. When I went to the Nissan dealership and asked abotu buying a new one from them, I was quoted $7,800.