Frost,
I have a combo very similar to yours. Recently, I have been experiencing a miss somewhere near 5000 rpm. I was first thinking it was the valve springs. Could it be the ignition system?
Before I started getting the engine miss, when I would spin this combo up past 5000 rpms, I could feel it flatten out. I would like to get this combo to pull hard to 6000 rpms. I had the Cobra lower ported by TMOSS. Is the cam the cause? What else can I do to get what I'm looking for?