I'm surprised that the Lincoln only makes 140hp. Luckily both of the engine options are pretty interesting. The Windsor has fairly extensive aftermarket support and parts are readily available for it, while the BMW diesel is just a pretty interesting talking point.
I would suggest nice, because a car that shoots flames needs to be respected! *sarcasm alert* No, but seriously, take car of it. its not actually that bad. Clean it up and maybe do some minor performance mods, like a better intake, or new brakes, things like that. Heck, maybe even some sly looking alloys, that would be cool.
I'm thinking that would be the way to go. I've already done paint touch-up properly w clear coat a wetsand and going to buff it all to a shine when the weather allows. I took off the torn up bumper stickers. The thing is I want it nice but ultimately saving up to buy a low miles miata and put a turbo on it and make it really nice. The best possible outcome being something similar to gingiums Miata Molly.
Idea: have somebody steal your car while simultaineously making it a ricer. You won't see the thief. Also, it's not like this would deprave you of anything.