Unless you have a 22.5" rear tire something is WAY off. 6K rpm with 10% slip and a 26" tire should be about 118. Even if you clicked it off at the first light at finish line, you aren't losing that much MPH unless on the brakes. Make sure you check trans fluid level in "N", otherwise it can be a few quarts low.
With those heads and cam it's going to be done around 5400-5600 is my guess. Sounds like a comp XE-HL series camshaft.
The times are about right for a 12.50 set up. 1.70-75 60', 7.9's, 12.50. MPH is pretty close at 1/8th too, 85. It should run low 11's and mid/upper teens for MPH is my guess.
This isn't a launch issue, it's a down the track issue.
The tune must be way off. Jet, fuel delivery, timing. The numbers say the converter is slipping more than 20%. If correct, that's horrible! The converter is the MOST important piece of the puzzle and the place where people cheap out the most!
