Here is my mirafone 1270. I have asked for help on this horn before, thanks to Dan Schultz I actually know what it is! I got it used for FREE

. It's a decent playing horn, although it has it's problems. When I got it the 3rd valve had a dent in it, I got it fixed no problems. Now that I can play a little better and have played a few other horns I noticed how stuffy it sounds.......well take a look at the pictures. I think I got it this way.
>here is a picture of the horn

here is the problem.......

the big question....how much, and is it worth fixing?