I'm in the same boat. I havee a 70 R/T SE that has a 71 383 in it. I have been looking for my engine since I bought my car in 2003. My car has had many owners over the years. Most of them, not suprisingly, know each other, and the car is well known in the area that they live. I have tracked the engine back to a guy who was friends with all of the owners in the area. He thinks he has my engine. I just need to go out to Missouri and look through his 20 plus barns full of Mopar stuff to find it. Maybe its in one of the barns, maybe it is not , but it will be fun sorting through his stuff to find my block. So I think it is possible. You just have to jar the memories of the previous owners. They sometimes remember things and call you back months later after you have spoken with them. Good Luck !