I agree with the statement above.

What et were you running that it slowed that much? What is the engine combo?

I run a mild 499. Indy SR heads, indy flat tappet cam 623/615 280/284, 12 to 1 comp, 5000 stall PTC converter in a 3500+ lb car. I ran 10.04 with the intake as cast with flashing and all with a pair of 600s that i jetted up 2 steps as compared to an indy single plane with a 1050 holley at 9.96.