Help my crap 60ft times!

I don't think taking the pinion snubber out is going to help you at all.It's there to stop the rear from twisting up into the floor.Longer shocks are a must with ss springs.12.90 at a 106 mph sounds about right. More rear gear will help but I agree with Pettybludart 456's will be a bit to much. Might want to think about 430s. My cuda runs 10.90s at 121 mph with 373s and 10.5X28 slicks and 11.10 with 265X60 drag radials at 5500 rpm. I leave the line at 1800 rpm and let the converter flash to 3500.My 60ft is 1.56 to 1.60. I drive it on the street all the time and some times show it. Good luck with your search for ET.