Early A Big Block And Motor Plate

stock B headers will hit early A idler arm if motor is placed in stock location. 67's and up seemed to move the suspension forward 2-3 inches as that is what it would have taken to get the Pro-parts passenger side to drop in unmolested. IF you could, see if moving motor forward 2-3 is an option for future header use if that is in your plans. You may want to build in a passenger side -1 bias off centerline for the obvious driver side steering shaft issues. Will have to move trans mount the same to keep parallelism. Or go with 3 U-joints and get steering shaft around the driver side manifold, probably easiest to engineer with least impact on everything else as those seem to fit well with that one steering shaft issue.