No knock at higher RPMs right?
Your 12.7 was in what DA, or how was the weather?
The cam 'specs' seem good, but was the cam degreed in? I ordered a 219/219-111 + 0 and the actual specs after having it ran on Thunder Racing's cam pro were : 220/219-112+0... Just shows the inaccuracy of things.
I mean, unless you just totally butchered the heads... It's hard to say.

 

60' isnt impressive. What size converter? If you could get a 1.65-1.7 60' you would see low 12.5 or lower IMO. That should be a strong cam.

Im going to be running a hair bigger then that with a 2800 converter in a 6.0 soon.

 

Like I said, I was having traction problems spinning, wheelhop....I'm running the yank tt3000.