What on earth is going on with your windscreen wipers!!?
Put some pictures up of the rust on your blue one. If its small just keep driving it.
Trying to find a perfect one is near on impossible unless you start blowing serious cash. Getting the carb fixed shouldn't be a big issue, there is a guy on this forum that you send him your carb and he rebuilds it good as new and everyone swears by him. But i can't remember who it is. Having the car run well without any misfires makes it a million times more enjoyable and gives you a lot more confidence to take it out.