The tach is actually off about 500 rpm :) I have a 7800 RPM rev limit and it is still stock lifters and stock stick shift cams. I have the 4.10 gears and run a 26" tall tire and leave the overdrive off making it a 1 to 1 ratio, So if you do the math I am at about 7300 RPM going through the traps at 136 mph.
:Looks like at the end of the run you are at 8000 RPM. Do you have the REV limited raised up that high and do you still have Hydraulic lifters?