I think your looking at the wrong part for your issue. I run low 6.70's at 100 mph in the 1/8 with a 1.45 60ft. If your doing 105 mph your car is pulling good, but not leaving. To be low 10's typically you should be in the mid to high 1.3x 60'. Have you checked your convertor slippage? Is your fuel system up to par for the engine? Figure out how to get your 60' better and I bet you'll find the "lost" ET that your shooting for.