Mopar Cam 284/484 or 288/497

Mistakes? Advanced 6 or 8 degrees. Seems like alot. I do have the x-heads and kb107 pistons. Would'nt compression be around 9.4 or 9.5? Also my gearing will help in low end grunt. Just asking thanks all for your answers! Very informative!
I seen Moper,and Cracked Back recommend this,more than a few times... Advancing the intake cam timing ,gives you more low end torque... It's an common trick,for making overcammed engines, not a turd on the below 2500-3000 range torque.