Need some help dipping into the 11's

I think you're off on the truck's weight. A lot. Also, from the launch picture, you've got a long way to go before you extend the front shocks all the way. A lot more travel to be had there, so there's a good bit more in it for sure. Your estimate is in B body territory. That's a full frame truck you have there. I believe you'll find it is over 4K. I could be wrong. It's happened before. lol