I have an 88 Cutlass Ciera, 2.8L
I've probably invested $2300 into this car since buying it for $300.
And it runs like a champ, it's even taken down v6 mustangs. I'm getting ~20-22mpg, and has a nice sound system in it that catches a lot of people's attention (you wouldn't expect a car like that to pump out hard bass lol).
It does have a couple things coming up I need to try to take care of, such as the front left wheel bearing and power steering pump, water pump and possibly some oil components.
But this little sleeper has served me well over the past 6 months since I bought it. I'm keeping it properly maintained, and it's keeping me properly happy.
I'd say either fix the engine, or upgrade it to a 3800 SC

, that's what I'd like to do with my tax refund. That or get a paint job >_>