HP to 1/4 mile ???

In the planning stages of a 69 dart 4 door build. Basically wondering how much hp are you guys making to run mid-high 11's?? I know every combo is different with regard to vehicle weight/gearing/traction etc.. I'm just looking for a ball park #. My planned combo 383/727 with 3.55/3.91 gears. This will be a small tire car (235/60 mt drag radial)...I was thinking aroud 475-500hp should do it.