Early a body BB questions

I have a 65 Dart I plan on turning into a drag only car. Do I have to convert to coil over on the front in order to have room for good race headers or any other good reason? This will probably be a back halved, frame connected, 12 point cage car so cutting the inner finders out is an option. I would like to stay with the torsion bars for budget concerns. I'd also like to be in the low 10's, but the faster the better. What other advice do you have for me?