Not Ranked
Retarding the cam timing should kill a little bit of the low-end. However, it's not going to kill it enough so that it's no longer a problem. 670lb-ft is a butt load, and making it 650 won't make the problems go away.
The 8.8 is a tough rearend as long as you got good axles/half-shafts. A lot of the 5.0 guys run into the 9's with 8.8's and C-clip eliminators. With any kind of street tire or drag radial, you're going to lose traction before you hurt anything anyway.
I'd leave it alone...
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