What rear suspension for bracket racing.

I'm going against the grain here I love the factory six leaf pack for set ups like yours .I run around 415hp /400 torque ish just make sure it's a good American steel leaf pack. Mine has a 2-in over Arch to accommodate larger tires, and the setups not so stiff that it beat your kidneys out driving on the street. I also run pinion snubber but I'm not sure I'm in love with it yet, I set it about a half an inch off the floor when I'm getting serious and drop it down for regular driving.