Re: Cracked Header - Now What?
If your gonna change your headers, I'd go with the JBA Shorty Headers. I installed them in my 89 FS 351W and I saw an increase in low end torque and more power throughout the rpm. Don't be cheap go with the coated header. There easy to install. I have the stock exhaust y-pipes and cats. They were changed about 8 months ago and I had to go to Ford ($580)because no one else carried them, it's a one piece. Good luck if you try to fabricate anything, I tried and it wasn't easy due to the way the exhaust pathway is set up. If you use full length headers they'll end just before the cross-member and you can't use the cats. Some people don't care about that but the Smog-Nazis in my state look down on that.
I swapped the muffler for a Flowmaster 50 series muffler. It sounds as good as it works. Helps scavange heat and increases hp.
For what you want I think this would be a good (and inexpensive) way to go.
Hope this helps,