I'm looking at a black 1983 Cadillac Eldorado coupe. It has around 120k miles on it, but I am unsure of what engine it has in it. I don't want the 4100 HT motor, I know they have problems. Does anyone know if an Eldorado this old with this many miles on it would be a good investment for $4,200, if the engine's not a 4100?