I am thinking about using one of these boxes in my 71 Charger over a rebuilt box from Firm Feel as I already have 2 of those (which I really like). The main reason I am considering it is because I am going to be running a 5.7 Hemi and I am concerned about the PS pump pressures. I am also intending on running a Hydroboost system, so I am trying to figure out how to make all this work.