Agreed...MPH number is the true measure of power. I had a bad launch and ran a 2.0 sixty foot time that still netted the same 107 MPH I did with a 1.7 sixty foot time. But my ET was a half second slower.
It might not be in the cards yet, but one day I'd call a quality converter company (PTC, Dynamic) and get one matched to your combo. A good converter isn't cheap, but makes such a difference.
Tuning the carb you already have will help tremendously. (I run a 750 Holley DP on my street/strip car and love it.) That relatively low MPH to me shows a possible fuel delivery issue.
What kind of tires are you running? Drag radials?
