My car here in Texas would run a mid 6.60 @ 101 MPH on several different tracks, I think one time it ran 102 (tire spin due to bad burn out), thats the only way I can see your running 4-5 MPH faster unless my tune was way off.
I can't speak to your tune, but I can speak to mine and I'm so lost it isn't funny. I can't even say the jet combo was right on the 6.38/10.14 run as I was making BIG jet changes and getting more lost each time.
That said, I wasn't surprised at the 107 best 1/8 mile speed per say. It went darn near 105 last July.
Motor still only has 30* of timing...LOVE these 4" crank small blocks!!