About one month ago, I bought a 1987 NA RX7. It has 130k miles and had the engine replaced in 2003 at 107k. The previous owner's records have a paper that shows it is the "(13B) FB01/FB02" from the "Deico Remy" / "JAX Reman, LLC : Powertrain" company(ies). On the receipt it is a "Reman Engine AJM E008-99-008R-46"

Can anyone tell me more about this factory or engine?

I've read the quality on reman engines is uneven and I'm interested in learning as much about my car as I can.