My plans for my 69 Dart Swinger 340
I have a 68 Barracuda with 4 wheel discs and power steering.
I also have a 69 340 4sp Swinger with manual steering and manual drum brakes.
While the Barracuda does stop quicker it’s not enough difference for the hassle. Of course I don’t drive like a lunatic (unless Im on an open back road and want to do a burnout) . For the Dart I used a smaller diameter master cylinder and larger wheel cylinders . It stops really nice with moderate effort. I would not do discs again .
As for the air shocks… they will transmit all the force onto the shock bolts because they become semi solid when pumped up . They offer no ride control . My recommendation is to get a set of hipo springs . They will be stiff at first but soften over time. I have the Mancini ones on the Barracuda and SS springs on the Dart . It rides fine as well but I used two off the same springs vs the biased set sold by the pair which is stiffer on the passenger side for weight transfer while launching a high HP car on the strip .