I run ladder bars. I have 50#s in the trunk as well as a 10 gallon fuel cell and 2 group 65 batterys that weigh 45#s a piece. 4.56 gears in the Dana and 2.77 first gear in the 904 trans with a continental 5700 8 inch converter and a turbo action brake. My motor is making around 575HP and is 11.7 to 1 410 stroker with a solid Hughes cam 276/280 @ .050 631 lift and Edelbrock heads. My car weight is 51.7 % front heavy and the car weighs in at 3160#s. I would start with 100 lbs in the trunk and see what it will do. I took alot of time and 2 oil pans to get it where it won't come down hard from a wheelstand and hurt parts. Good luck with it. Here is a vid of how Lisa's car use to leave before I got it to drag the bumper. This vid is the 3rd shake down run with the new stroker motor in 2007.
http://youtu.be/l2CggdLuLPc