I took all of those measurements about 6yrs ago, the frame rails/shock towers/torsion bars/lower arms/steering gear are all pulled in ~1.25" per side, PLUS the engines are mounted ~1.75-1.875" farther forward on the early-A's....this leads to heavy contact with the steering linkage. I managed to put the 6-1 Mopar Slanty header('67 & up only) into My '64 GT, but I heated & worked the S*^T out of it, like in&out 12× and torch/hammer/fold/welding. It's in there, but it ain't pretty, I will cut out & fix what is needed now that it's established.