My jeep had a crate 401 in it when I bought it. The engine had a metal "remanufactured" tag on it, but it didn't have the rebuilders name on it.
After some detective work, I found out that it was bought through Advanced Auto Parts.
Over time, it developed a constant vibration. After spending a lot of time and money trying to eliminate the obvious, and then some, we decided to pull it out, tear it down, and take a look.
It was a mess! Talk about a shoddy rebuild job! It was so bad that we decided not to put it back together.
So, unless the reman was done by a reputable shop that "knows" AMC's, I'd go another route.
Here's one of the good ones...