I'm glad I read this thread, as I've been having somewhat similar thoughts. When you're cruising around in your perfectly tuned stang, it's the best thing in the world. But when you're sitting in traffic in 95 degree heat without a/c, worrying about how long your car is gonna last before it overheats again, then it's not so fun.
However: This summer I've been using my dad's Nissan Maxima while he's been out of town (great car btw). Anyway my stang is in his garage and I go to visit it every week or two, and drive it around a little. It's like a whole new car! I used to get bored of the look sometimes, and think of things I should do to change it. Now when I go look at it after not seeing it for two weeks, I can honestly say that classic mustangs are one of the best shapes ever used for a car. It feels faster and louder than I remembered, and people sure do stare. If you have a situation where you could not see the car for a while then go see it later, maybe that would help.
I've been wondering how long I can hold onto this car, as I'm about to graduate college (well, 2 years). I can either tough it out or find something reliable so I don't get ****ed over one day when I need to get somewhere important. I know it's gonna happen sooner or later (again!). It definitely helps to have people urge you on and tell you to stick with it.
Back to the topic, your car has a beautiful blue color and the black stripes go nicely. I have a chin spoiler too and like it.. but I agree with you on the spoiler. Those rims you have look real nice though.. maybe some wider tires with the same style rims if you could trade someone, I dunno.. I'm thinking of getting wider rims myself, but I don't think they make mine anymore and I'm not sure how wide would fit on a 68 w/o modification anyway.
Good luck with the car, tough it out! I can't wait for a "real" job so I can do some big mods that I really would like to do... well, what am I saying - of course I can wait for a real job!