I purchased a set of the Trick Flow 240 heads this winter in my quest to go a little bit faster. I know this isn't an apple to apple comparison, but figured maybe the info might be helpful to some out there to some real world numbers.

Old Combo:
440 .030 over
10.3:1
Scat rods
Speed Pro Pistons
.590 MP cam
Victor Intake
750 Holley
440 source heads

New Combo:
440 .040 over
10.9:1
Eagle Rods
Ross Pistons (1.094 pin)
.557 MP cam
Victor Intake
850 Proform
Trick Flow 240

I only got 1 test and tune in thus far on the new combo, but the old combo in similar weather condition ran mid 10.80's. Yesterday the new combo ran a best of 10.56.