Duster master cylinder setup suggestions with big block

[hemi68charger]

Hey gang...
Have a question.... Helping another friend with this. He has this '71 Duster with a blown 440 with the fender well headers...... He is potentially going to replace the fender well headers with "framerail headers", for a lack of a better term. I noticed that the master cylinder was WAY close to the headers ( setup by the previous owner ). The proportioning valve is also repositioned in the area where the battery USED to be. I was thinking of utilizing one of the OEM offset brackets that are used for the power brakes on A-bodies if that is at all possible. Then, we would reposition the proportioning valve to its original position and then get ALL new brake lines. I have suggested that we restore his complete system since it looks real old and the car has a LOT of power....... Safety, safety, safety......

1. His engine compartment
2. the OEM A-body adapter..